Question

Characteristics of a respiratory system​

Answer 1

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.

Answer 2

they allow you to breathe, they exchange gases in bloodstream and body tissues, and they allow you to smell.