Air exits through nose or mouth.
 a. True
 b. False
 Carbon dioxide is carried to the lungs.
 a. True
 b. False
 Carbon dioxide diffuses into a capillary.
 a. True
 b. False
 Carbon dioxide diffuses into an alveolus.
 a. True
 b. False
 Carbon dioxide is released from the mitochondria.
 a. True
 b. False