Multiple Choice
If N2gas comprises 79 percent of atmospheric air at sea level, what is PN2?
A) about 300 mm Hg
B) about 400 mm Hg
C) about 500 mm Hg
D) about 600 mm Hg
E) about 700 mm Hg
Correct Answer:
Verified
Correct Answer:
Verified
Q13: A _ uses air sacs to ventilate
Q14: Alveoli are the respiratory surfaces of birds.
Q15: As altitude increases, _.<br>A) PO<sub>2</sub>increases<br>B) PO<sub>2</sub>decreases<br>C) PCO<sub>2</sub>increases<br>D)
Q16: Alveoli are surrounded by pulmonary capillaries .
Q17: The _ changes during exercise.<br>A) residual volume<br>B)
Q19: Which event occurs in the lungs?<br>A) Free
Q20: The _ drive(s) inhalation by stimulating contraction
Q21: During forceful exhalation, the _ muscles contract.<br>A)
Q22: The primary muscle(s) involved in human breathing
Q23: The number-one risk factor for sudden infant