Question

What should be the characteristics features of respiratory system?

Answer 1

Answer:

Here are some features of the alveoli that allow this: they give the lungs a really big surface area. they have moist, thin walls (just one cell thick) they have a lot of tiny blood vessels called capillaries.

Answer 2

Answer:

Respiratory System Principles

Movement of an oxygen-containing medium so it contacts a moist membrane overlying blood vessels. Diffusion of oxygen from the medium into the blood. Transport of oxygen to the tissues and cells of the body. Diffusion of oxygen from the blood into cells.