BIO 202 MIDTERM- RESPIRATORY
SYSTEM (WEEK 4) QUESTIONS WITH
CORRECT ANSWERS 2026-2027
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 -
result in an increase in the thickness of the respiratory membrane, which would decrease diffusion of re
spiratory gases.
SYSTEM (WEEK 4) QUESTIONS WITH
CORRECT ANSWERS 2026-2027
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 -
result in an increase in the thickness of the respiratory membrane, which would decrease diffusion of re
spiratory gases.
