Question: The way the body is built tells you what a part is supposed to do, where structure matches function. You see this especially in the lungs, where simple squamous epithelium forms a very thin barrier. This tissue is a single layer of flat cells, which lets gases like oxygen move through it easily and quickly. Because it's so thin, oxygen passes through via simple diffusion drifting from areas of high concentration to low concentration without the body spending any energy. If you swapped this out for stratified squamous epithelium, those extra layers of cells would make gas exchange way less efficient. It would be even worse if you used dense connective tissue; the thick collagen fibers there are meant for strength, not for letting things pass through or move, so they would block the process almost entirely. It's like trying to breathe through a thick wall instead of a thin sheet of glass, making normal lung function impossible. It makes me wonder how other tissues manage the balance between being sturdy and staying flexible. How do the properties of the extracellular matrix especially that mix of strong collagen and flexible elastin help organs like the heart and skin maintain both. Need Assignment Help?