BOTH a and b d. Taking a deep breath in, you expire into a balloon until you can fill the balloon no more with your breath. The balloon has a circumference of 75 centimeters at its widest diameter. Bronchioles have a greater diameter than do bronchi. True b. False 66.
Pulmonary arteries contain a greater concentration of oxygen than do pulmonary veins.
True b. False 67. Pulmonary capillaries are located within the walls of the alveoli. True b. False 68. CNS control of involuntary breathing occurs in the pons and medulla of the brain. True b. False 69.