Bio 253 Lab Final Exam Questions With Verified Answers
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Course
Bio 253
Institution
Bio 253
Bio 253 Lab Final Exam Questions With
Verified Answers
Why is the trachea lined with mucus? - answerThe mucus helps trap foreign particles before
they can enter the lungs.
In smaller airways there is: - answerLess cartilage and more smooth muscle.
T/F: Heating a gas at a constant pressure will...
Bio 253 Lab Final Exam Questions With
Verified Answers
Why is the trachea lined with mucus? - answer✔✔The mucus helps trap foreign particles before
they can enter the lungs.
In smaller airways there is: - answer✔✔Less cartilage and more smooth muscle.
T/F: Heating a gas at a constant pressure will increase the volume that it occupies -
answer✔✔True
T/F If the volume of a container is halved without removing any of the gas, the gas pressure
doubles - answer✔✔True
T/F Pressure is (F) per unit Area (A) - answer✔✔True
T/F In a closed container, pressure increases when the temperature inside the container increases
- answer✔✔True
T/F When measured in a closed container, pressure has the same value everywhere -
answer✔✔True
Which law states that the volume of a gas is directly proportional to temperature, if the pressure
is held constant? - answer✔✔Charles' law
You collect an expired gas sample and find that the ambient temperature is 22°C, the volume of
the gas is 5 L and atmospheric pressure is 754 mmHg (ATPS conditions). What volume would
that gas have occupied in the lungs (BTPS conditions)? [Note: at 22°C, PH2O is 20 mmHg]. -
answer✔✔5.45 L
Now, what real difference does it make if we don't express O2 and CO2 in STPD? Here the VO2
at ATPS is 300 mL/min; atmospheric pressure is 754 mmHg; and the ambient temperature is
22°C. [Note: at 22°C, PH2O is 20 mmHg]
What is the rate of O2 consumption at STPD? - answer✔✔268 mL/min
Under STPD conditions, if the O2 consumption is 330 mL/min, then when expressed in
mmol/min, it is: - answer✔✔14.7 mmol/min
T/F: Expired gas volumes need to be corrected for the effects of changes in temperature in the
environment - answer✔✔True
T/F: Resistance is calculated from the pressure difference/flow rate - answer✔✔True
T/F: the longer the tube, the greater the resistance to flow - answer✔✔True
T/F: For any pressure, the greater the resistance, the greater the flow - answer✔✔False
T/F: The wider the tube, the greater the resistance to flow - answer✔✔False
T/F: Flow along a tube is driven by a difference in pressure - answer✔✔True
T/F: Flow has the SI units of cubic meters per second - answer✔✔True
T/F: For any constant pressure gradient, it takes twice as long for a particle to flow twice as far -
answer✔✔True
T/F: In respiratory physiology, it is common to use L/min for the flow unit - answer✔✔True
T/F: The rate of flow along a tube is proportional to the pressure gradient - answer✔✔True
Which of the following is a correct statement about the respiratory system? - answer✔✔By the
time air reaches the lower respiratory tract, it is warmed to body temperature and fully saturated
with water.
Will resistance be greater in smaller or larger airways? - answer✔✔Larger
Is the following an advantage or disadvantage of turbulent flow:
Allows more efficient removal of dust and other particles from the inspired air -
answer✔✔Advantage
Is the following an advantage or disadvantage of turbulent flow:
Allows all of the inspired air to be exposed to the upper airways epithelial cells -
answer✔✔Advantage
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