Question

How are carbon dioxide and oxygen exchanged in the lungs?
A. Small blood vessels pass next to the air sacs of the lung, and gases are exchanged across a thin membrane.
B. Large blood vessels constrict and enlarge near the lung tissue so that gases can be exchanged.
C. The walls of the arteries thicken, harden, and lose their elasticity so that oxygen can pass through them.
D. Carbon dioxide and oxygen are exchanged in the aorta.

Answer 1

I think.... A

Answer 2

correct?

Answer 3

yup you are