Epithelial Tissues and Muscle
Ever wonder why lung tissues are so thin? Simple squamous epithelium found in alveoli and capillaries consists of a single layer of flat cells, making it perfect for diffusion and gas exchange. The thinness allows oxygen and carbon dioxide to pass through easily.
When your body needs protection, it uses stratified squamous epithelium. Found in your skin, mouth, and nostrils, this tissue has multiple layers of thin cells that can be continuously replaced when damaged by everyday wear and tear.
Simple cuboidal epithelium lines your digestive tract, including stomach and intestines. These larger, box-shaped cells have plenty of room to produce and secrete important substances like digestive enzymes and acids that break down your food.
Fun Fact: Your heart muscle (cardiac muscle) contracts involuntarily - you never have to think about making your heart beat, unlike the muscles that move your arms and legs!
