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Angela Martinez
11/13/2025
Biology
Skeletal and Muscular System Guided Notes
344
•
Nov 13, 2025
•
Angela Martinez
@angelamartinez_tvoi
Get ready to explore the amazing systems that give your... Show more







This week focuses on two essential body systems that work together: the skeletal system and the muscular system. These systems form the foundation of human movement and structure.
The course content includes guided notes, videos, and interactive lab activities that will help you understand bone structure and muscle function. You'll learn how bones provide support and protection, while muscles allow for movement and physical activity.
Your assignments this week include completing guided notes, watching educational videos on EdPuzzle, taking a quiz, and completing a Gizmos lab about muscles and bones. All these activities will help reinforce key concepts about these important body systems.
Pro Tip: As you study these systems, think about how they work together in your daily life - every time you walk, write, or even breathe, your skeletal and muscular systems are working as a team!

Bones are more than just rigid supports - they're living tissues with complex structures! Osteons run through compact bone, containing blood vessels that deliver oxygen and nutrients to living bone cells (osteocytes). This network forms a critical system for keeping bones healthy and functional.
When bones break, your body jumps into action with an amazing repair process. First, a blood clot forms at the break, and new bone begins forming within eight hours. A soft cartilage callus develops, followed by spongy bone that's later replaced by stronger compact bone. This is why keeping broken bones immobilized (like with a cast) is crucial - it takes about three weeks for that stronger compact bone to form.
Different types of fractures require different treatment approaches. A simple fracture occurs when a bone breaks but doesn't break through the skin. A compound fracture is more serious, with the broken bone protruding through the skin. A stress fracture is a thin crack that develops in a bone, often from repetitive force.
Did You Know? Your body is constantly remodeling your bones throughout your life! Specialized cells called osteoclasts break down old bone tissue while osteoblasts build new bone, helping maintain strong, healthy bones.

Your body relies on different muscle types for various functions. Smooth muscle lines hollow organs like your stomach and intestines and is called involuntary muscle because you can't consciously control it - it works automatically to keep your body functioning.
When muscles work, they form partnerships. Take your arm for example - when your tricep contracts, your bicep relaxes, allowing your lower arm to straighten. This opposing relationship helps create precise, controlled movements throughout your body.
During intense exercise, your muscles need energy fast! When oxygen is limited during hard workouts, your muscles switch to lactic acid fermentation - an anaerobic process that breaks down sugars to produce ATP (energy) without oxygen. This process helps your muscles keep working hard even when oxygen delivery can't keep up with demand.
Try This: Extend your arm straight out, then bend it at the elbow. Notice how your bicep contracts when bending and relaxes when straightening. That's your muscular system in action!

Your skeleton is an engineering marvel with some fascinating features! Did you know adults have 206 bones while babies are born with about 300? Many of these bones fuse together as we grow. Your skeleton divides into two main sections: the axial skeleton (skull, spine, ribs) and the appendicular skeleton (shoulders, arms, hips, legs).
Bones have different layers that serve specific purposes. The outer layer is compact bone - dense and strong for protection. Inside, you'll find spongy bone which is lighter and contains bone marrow. Red bone marrow produces blood cells, while yellow bone marrow stores fat.
The development of bones is a fascinating process called ossification. During fetal development, cartilage cells transform into osteoblasts which create the bone structure. These same cells continue to help with bone growth and repair throughout your life.
Amazing Fact: More than half of your bones are in your hands and feet - 106 bones total! This incredible number of small bones allows for the precise movements needed for everything from typing to playing sports.

Your skeletal system is constantly changing. Through a process called remodeling, old bone cells are broken down by osteoclasts and replaced with new bone tissue. This ongoing renovation keeps your bones strong and healthy throughout your life.
Joints are where two or more bones meet, held together by tough bands called ligaments. These connections come in various types and allow different movements. Unfortunately, joints can develop problems like osteoarthritis (wear and tear), rheumatoid arthritis (autoimmune inflammation), bursitis , or sprains (stretched or torn ligaments).
Your skeletal system serves multiple crucial functions beyond just support. It protects vital organs (like your brain and lungs), stores essential minerals like calcium, houses bone marrow for blood cell production, and provides attachment points for muscles to create movement.
Health Tip: You can strengthen your bones through regular weight-bearing exercise and a diet rich in calcium and vitamin D. These habits help prevent bone loss as you age and reduce your risk of fractures.

Your body contains an impressive network of more than 600 muscles that make up about 40% of your total body weight! These muscles work in pairs and can only pull (not push), which is why they operate as opposing teams - when one contracts, the other relaxes.
There are three main muscle types in your body, each with specialized functions. Smooth muscle lines organs like your stomach and intestines, working involuntarily. Cardiac muscle is found only in your heart, contracting rhythmically without conscious control. Skeletal muscles are the voluntary muscles that attach to bones via tendons and allow movement.
The strength and endurance of your muscles depend on their fiber types. Slow-twitch muscle fibers contain myoglobin for storing oxygen and excel at endurance activities like long-distance running. Fast-twitch muscle fibers provide bursts of strength for quick movements like sprinting but fatigue more quickly, using anaerobic metabolism that produces lactic acid.
Movement Mechanics: When you move, your skeletal muscles contract according to the sliding filament theory - microscopic protein filaments called actin and myosin slide past each other, shortening the muscle and creating force. This elegant molecular machinery powers every movement you make!
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
You can download the app in the Google Play Store and in the Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
App Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Angela Martinez
@angelamartinez_tvoi
Get ready to explore the amazing systems that give your body structure and movement! In this summary, we'll dive into the skeletal and muscular systems - the framework that supports you and the machinery that moves you through life. Understanding... Show more

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This week focuses on two essential body systems that work together: the skeletal system and the muscular system. These systems form the foundation of human movement and structure.
The course content includes guided notes, videos, and interactive lab activities that will help you understand bone structure and muscle function. You'll learn how bones provide support and protection, while muscles allow for movement and physical activity.
Your assignments this week include completing guided notes, watching educational videos on EdPuzzle, taking a quiz, and completing a Gizmos lab about muscles and bones. All these activities will help reinforce key concepts about these important body systems.
Pro Tip: As you study these systems, think about how they work together in your daily life - every time you walk, write, or even breathe, your skeletal and muscular systems are working as a team!

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Bones are more than just rigid supports - they're living tissues with complex structures! Osteons run through compact bone, containing blood vessels that deliver oxygen and nutrients to living bone cells (osteocytes). This network forms a critical system for keeping bones healthy and functional.
When bones break, your body jumps into action with an amazing repair process. First, a blood clot forms at the break, and new bone begins forming within eight hours. A soft cartilage callus develops, followed by spongy bone that's later replaced by stronger compact bone. This is why keeping broken bones immobilized (like with a cast) is crucial - it takes about three weeks for that stronger compact bone to form.
Different types of fractures require different treatment approaches. A simple fracture occurs when a bone breaks but doesn't break through the skin. A compound fracture is more serious, with the broken bone protruding through the skin. A stress fracture is a thin crack that develops in a bone, often from repetitive force.
Did You Know? Your body is constantly remodeling your bones throughout your life! Specialized cells called osteoclasts break down old bone tissue while osteoblasts build new bone, helping maintain strong, healthy bones.

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Your body relies on different muscle types for various functions. Smooth muscle lines hollow organs like your stomach and intestines and is called involuntary muscle because you can't consciously control it - it works automatically to keep your body functioning.
When muscles work, they form partnerships. Take your arm for example - when your tricep contracts, your bicep relaxes, allowing your lower arm to straighten. This opposing relationship helps create precise, controlled movements throughout your body.
During intense exercise, your muscles need energy fast! When oxygen is limited during hard workouts, your muscles switch to lactic acid fermentation - an anaerobic process that breaks down sugars to produce ATP (energy) without oxygen. This process helps your muscles keep working hard even when oxygen delivery can't keep up with demand.
Try This: Extend your arm straight out, then bend it at the elbow. Notice how your bicep contracts when bending and relaxes when straightening. That's your muscular system in action!

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Your skeleton is an engineering marvel with some fascinating features! Did you know adults have 206 bones while babies are born with about 300? Many of these bones fuse together as we grow. Your skeleton divides into two main sections: the axial skeleton (skull, spine, ribs) and the appendicular skeleton (shoulders, arms, hips, legs).
Bones have different layers that serve specific purposes. The outer layer is compact bone - dense and strong for protection. Inside, you'll find spongy bone which is lighter and contains bone marrow. Red bone marrow produces blood cells, while yellow bone marrow stores fat.
The development of bones is a fascinating process called ossification. During fetal development, cartilage cells transform into osteoblasts which create the bone structure. These same cells continue to help with bone growth and repair throughout your life.
Amazing Fact: More than half of your bones are in your hands and feet - 106 bones total! This incredible number of small bones allows for the precise movements needed for everything from typing to playing sports.

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Your skeletal system is constantly changing. Through a process called remodeling, old bone cells are broken down by osteoclasts and replaced with new bone tissue. This ongoing renovation keeps your bones strong and healthy throughout your life.
Joints are where two or more bones meet, held together by tough bands called ligaments. These connections come in various types and allow different movements. Unfortunately, joints can develop problems like osteoarthritis (wear and tear), rheumatoid arthritis (autoimmune inflammation), bursitis , or sprains (stretched or torn ligaments).
Your skeletal system serves multiple crucial functions beyond just support. It protects vital organs (like your brain and lungs), stores essential minerals like calcium, houses bone marrow for blood cell production, and provides attachment points for muscles to create movement.
Health Tip: You can strengthen your bones through regular weight-bearing exercise and a diet rich in calcium and vitamin D. These habits help prevent bone loss as you age and reduce your risk of fractures.

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Your body contains an impressive network of more than 600 muscles that make up about 40% of your total body weight! These muscles work in pairs and can only pull (not push), which is why they operate as opposing teams - when one contracts, the other relaxes.
There are three main muscle types in your body, each with specialized functions. Smooth muscle lines organs like your stomach and intestines, working involuntarily. Cardiac muscle is found only in your heart, contracting rhythmically without conscious control. Skeletal muscles are the voluntary muscles that attach to bones via tendons and allow movement.
The strength and endurance of your muscles depend on their fiber types. Slow-twitch muscle fibers contain myoglobin for storing oxygen and excel at endurance activities like long-distance running. Fast-twitch muscle fibers provide bursts of strength for quick movements like sprinting but fatigue more quickly, using anaerobic metabolism that produces lactic acid.
Movement Mechanics: When you move, your skeletal muscles contract according to the sliding filament theory - microscopic protein filaments called actin and myosin slide past each other, shortening the muscle and creating force. This elegant molecular machinery powers every movement you make!
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
You can download the app in the Google Play Store and in the Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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App Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user