BIO 202 MIDTERM- RESPIRATORY
SYSTEM (WEEK 4) QUESTIONS WITH
CORRECT ANSWERS 2025-2026
What determines the direction of gas movement? CORRECT ANSWER partial pressure
differences
The net diffusion of oxygen out of the blood occurs during which phase? CORRECT
ANSWER Internal respiration
True/False? At the venous end of systemic capillaries, there is no net movement of O2 and CO2
CORRECT ANSWER True
Which direction do gases diffuse at the arterial end of the pulmonary capillaries? CORRECT
ANSWER O2 diffuses from the alveoli into the blood, while CO2 diffuses from the blood into the
alveoli.
Where in the lungs does gas exchange take place? CORRECT
ANSWER Gas exchange occurs between the alveoli and the blood
If intrapulmonary (intra-
alveolar) pressure was 760 mm Hg, what would you expect the intrapleural pressure to be?
CORRECT ANSWER 756 mmHg
Respiratory gases cross the respiratory membrane by CORRECT ANSWER Simple diffusion
Which environment would have the highest oxygen partial pressure? CORRECT ANSWER
alveolar air
Surfactant is produced by -RCORRECT ANSWER -Type II pneumocytes
Increased production of surfactant would CORRECT ANSWER
SYSTEM (WEEK 4) QUESTIONS WITH
CORRECT ANSWERS 2025-2026
What determines the direction of gas movement? CORRECT ANSWER partial pressure
differences
The net diffusion of oxygen out of the blood occurs during which phase? CORRECT
ANSWER Internal respiration
True/False? At the venous end of systemic capillaries, there is no net movement of O2 and CO2
CORRECT ANSWER True
Which direction do gases diffuse at the arterial end of the pulmonary capillaries? CORRECT
ANSWER O2 diffuses from the alveoli into the blood, while CO2 diffuses from the blood into the
alveoli.
Where in the lungs does gas exchange take place? CORRECT
ANSWER Gas exchange occurs between the alveoli and the blood
If intrapulmonary (intra-
alveolar) pressure was 760 mm Hg, what would you expect the intrapleural pressure to be?
CORRECT ANSWER 756 mmHg
Respiratory gases cross the respiratory membrane by CORRECT ANSWER Simple diffusion
Which environment would have the highest oxygen partial pressure? CORRECT ANSWER
alveolar air
Surfactant is produced by -RCORRECT ANSWER -Type II pneumocytes
Increased production of surfactant would CORRECT ANSWER
