RESPIRATORY - PHYSIOLOGY
BIOL 252 ACTUAL EXAM
2025/2026 QUESTIONS AND
100% CORRECT ANSWERS
Which of the following is NOT a function of the
respiratory system?
a. Exchange of gases between the atmosphere and blood
b. Homeostatic regulation of body pH
c. Production of hemoglobin
d. Protection from inhaled pathogens
e. Vocalization
c. Production of hemoglobin
Air moves from one area to another due to differences in
which factor?
a. Volume
,b. Pressure
c. Temperature
d. Resistance
b. Pressure
Explanation: Gases flow down pressure gradients—from high
to low pressure—according to basic gas laws.
According to the principles of bulk flow, air moves:
a. From low pressure to high pressure
b. From high pressure to low pressure
c. From low volume to high volume
d. Randomly within the lungs
b. From high pressure to low pressure
Explanation: Bulk flow follows pressure gradients — air moves
from areas of higher pressure to areas of lower pressure,
just like blood flow.
What generates the pressure gradients that drive bulk
flow in the respiratory system?
a. Elastic recoil of alveoli
,b. The muscular pump formed by the diaphragm and
intercostal muscles
c. Passive diffusion across the pleura
d. The muscular pump formed by the internal and external
intercostal muscles
b. The muscular pump formed by the diaphragm and
intercostal muscles
Explanation: The diaphragm and intercostals act as a muscular
pump, changing thoracic volume to create pressure
differences that move air.
What does lung elastance refer to?
a. The ability of the lungs to stretch easily during
inspiration
b. The ability of the lungs to return to their resting
volume after being stretched
c. The amount of air remaining in the lungs after
exhalation
d. The resistance to airflow in the bronchial tree
b. The ability of the lungs to return to their resting volume
after being stretched
, Elastance is the property of the lungs that allows them
to recoil back to their original resting volume once the
stretching force (inhalation) is released. It’s the opposite of
compliance, which measures how easily the lungs stretch.
Exchange of the air between the
a. Blood and cells
b. Atmosphere and blood
c. Lungs and blood
d. Atmosphere and lungs
d. Atmosphere and lungs
Exchange of the O2 and CO2 between the
a. Blood and cells
b. Atmosphere and blood
c. Lungs and blood
d. Atmosphere and lungs
c. Lungs and blood
Exchange of the gases between the
a. Blood and cells
b. Atmosphere and blood
c. Lungs and blood
d. Atmosphere and lungs
a. Blood and cells
BIOL 252 ACTUAL EXAM
2025/2026 QUESTIONS AND
100% CORRECT ANSWERS
Which of the following is NOT a function of the
respiratory system?
a. Exchange of gases between the atmosphere and blood
b. Homeostatic regulation of body pH
c. Production of hemoglobin
d. Protection from inhaled pathogens
e. Vocalization
c. Production of hemoglobin
Air moves from one area to another due to differences in
which factor?
a. Volume
,b. Pressure
c. Temperature
d. Resistance
b. Pressure
Explanation: Gases flow down pressure gradients—from high
to low pressure—according to basic gas laws.
According to the principles of bulk flow, air moves:
a. From low pressure to high pressure
b. From high pressure to low pressure
c. From low volume to high volume
d. Randomly within the lungs
b. From high pressure to low pressure
Explanation: Bulk flow follows pressure gradients — air moves
from areas of higher pressure to areas of lower pressure,
just like blood flow.
What generates the pressure gradients that drive bulk
flow in the respiratory system?
a. Elastic recoil of alveoli
,b. The muscular pump formed by the diaphragm and
intercostal muscles
c. Passive diffusion across the pleura
d. The muscular pump formed by the internal and external
intercostal muscles
b. The muscular pump formed by the diaphragm and
intercostal muscles
Explanation: The diaphragm and intercostals act as a muscular
pump, changing thoracic volume to create pressure
differences that move air.
What does lung elastance refer to?
a. The ability of the lungs to stretch easily during
inspiration
b. The ability of the lungs to return to their resting
volume after being stretched
c. The amount of air remaining in the lungs after
exhalation
d. The resistance to airflow in the bronchial tree
b. The ability of the lungs to return to their resting volume
after being stretched
, Elastance is the property of the lungs that allows them
to recoil back to their original resting volume once the
stretching force (inhalation) is released. It’s the opposite of
compliance, which measures how easily the lungs stretch.
Exchange of the air between the
a. Blood and cells
b. Atmosphere and blood
c. Lungs and blood
d. Atmosphere and lungs
d. Atmosphere and lungs
Exchange of the O2 and CO2 between the
a. Blood and cells
b. Atmosphere and blood
c. Lungs and blood
d. Atmosphere and lungs
c. Lungs and blood
Exchange of the gases between the
a. Blood and cells
b. Atmosphere and blood
c. Lungs and blood
d. Atmosphere and lungs
a. Blood and cells
