Blood Composition and Function
Ever wonder how oxygen gets from your lungs to your toes? Blood does that job! Blood transports oxygen from lungs to cells, carries carbon dioxide back to lungs, delivers nutrients from your digestive system, and removes waste products. It also distributes heat throughout your body and delivers hormones where they're needed.
Your blood consists of three main components in specific proportions. Plasma makes up about 55% of blood volume, red blood cells account for 45%, and white blood cells and platelets make up just 1%. Each component plays a crucial role in keeping you healthy.
Plasma is the light yellow fluid portion of blood that's 90% water. It carries nutrients, gases, hormones, and waste products through your bloodstream. It also contains clotting factors that help stop bleeding when you're injured.
Fun Fact: Red blood cells have a unique disk shape with a center indentation. This special shape increases their surface area, allowing them to absorb more oxygen. The darker your blood looks, the more oxygen it contains!
Erythrocytes (red blood cells) contain a complex protein called hemoglobin that binds to oxygen and carbon dioxide. These cells give blood its red color and are specially designed to maximize their oxygen-carrying capacity.
