GMS6402: MEDICAL PULMONARY PHYSIOLOGY- PULMONARY CIRCULATION. Exam Questions With Verified Answers
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Course
GMS6402
Institution
GMS6402
GMS6402: MEDICAL PULMONARY
PHYSIOLOGY- PULMONARY
CIRCULATION. Exam Questions With
Verified Answers
T/F: a RBC will spend about 0.75 seconds in the pulmonary capillary bed; during this time the
RBC will transverse 3 alveoli - answerTrue
T/F: diffusion will complete in 0.25 seconds; diffusion w...
GMS6402: MEDICAL PULMONARY
PHYSIOLOGY- PULMONARY
CIRCULATION. Exam Questions With
Verified Answers
T/F: a RBC will spend about 0.75 seconds in the pulmonary capillary bed; during this time the
RBC will transverse 3 alveoli - answer✔True
T/F: diffusion will complete in 0.25 seconds; diffusion will be complete after a RBC passes the
first alveolus - answer✔True
T/F: elastic fibers wrap around the alveoli - answer✔True
T/F: the pulmonary circulation receives 100% of cardiac output from the RIGHT heart; therefore
it's high flow - answer✔True
T/F: the pulmonary circulation is a low pressure system (around 14mmHg in the pulmonary
artery) - answer✔True
T/F: the pulmonary circulation is HIGH compliant; therefore it can tolerate large increases in
blood volume with little to no change in pressure - answer✔True
as additional volume of blood enters the lungs, why doesn't pressure increase? - answer✔-
capillaries that previously had little or no blood flow are RECRUITED
-happens especially in APEX
-as a result pulmonary pressure does not increase much
-DISTENTION: blood filled capillaries are already open but they dilate even more in order to
accommodate increased blood volume
T/F: recruitment and distention occur simultaneously but recruitment usually happens first -
answer✔True
T/F: recruitment and distension keep pulmonary pressure LOW - answer✔True
T/F: there is SLIGHTLY more ventilation at the base than the apex - answer✔True
are the lungs uniformly perfused with blood? - answer✔no
T/F: due to gravity, there is SIGNIFICANTLY more perfusion at the base than the apex -
answer✔True
why is there so little blood being pumped to the apex of the lung? - answer✔-low pressure
-where pulmonary artery is coming in, there is not a lot of pressure to get blood up towards the
apex of the lung
ventilation: perfusion ratio - answer✔V/Q
T/F: the ventilation to perfusion ratio varies within the lungs - answer✔True
T/F: as you move from base to apex the ventilation perfusion ratio INCREASES significantly -
answer✔True
T/F: tuberculosis bacterium prefer alveoli that have a higher PAO2 (higher levels of ventilation);
therefore we would see TB in the apex - answer✔True
T/F: the relative V/Q mismatch is tolerable at rest, but can worsen significantly with disease -
answer✔True
What is normal V/Q? - answer✔0.8
how does V/Q change when there is a pulmonary embolism? - answer✔-V/Q = INFINITY
-lungs still ventilated but there is NO blood perfusion (Q=0)
-alveolar gas composition resembles inspired air
how does V/Q change when there is a shunt? - answer✔-V/Q= 0
-lungs are NOT ventilated (V=0) but they are perfused with blood
-alveolar gas composition resembles venous blood
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