The respiratory membrane is composed of two extremely thin layers of simple squamous epithelium. Explain how the structure of the respiratory membrane allows its function.

The functions of epithelial cells ranges from secretion, sensing, selective absorption, protection, and transcellular transport,

but these epithelial layers contain no blood vessels, and then they must receive nourishment via diffusion of substances from the underlying connective tissue, through the basement membrane.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.