You and a friend are having a contest to see who can hold his or her breath the longest. Your friend hyperventilates before holding his breath, and subsequently wins the contest. Why did hyperventilation give him an advantage?

Henry's law states that the degree to which a gas dissolves in a liquid is determined by its:

a. partial pressure.

b. solubility.

c. surface tension.

d. Both a and b are correct.

e. All of the above are correct.

Fill in the blanks: When the alveolar Po₂ decreases, the pulmonary arterioles_____. When the arteriolar Pco₂ increases, the bronchioles_______.