Block 4 13 Pulmonary Circulation Exam
With 100% Correct And Verified Answers
How long does a RBC spend in a pulmonary capillary bed?
How many alveoli does it transverse in that time? - Correct
Answer-0.75 seconds
3 alveoli
Under normal circumstances how long will it take for
diffusion of O2 and CO2 to be complete in the alveoli? -
Correct Answer-0.25 seconds (after RBC moves past the
first alveolus)
Describe the path a RBC takes through the pulmonary
capillary network - Correct Answer-RV, pulmonary artery,
capillaries of 2 alveoli, pulmonary vein, LA
What are the 'relative amounts' of flow within the lungs? -
Correct Answer-Blood flow in the lungs is high, as the lungs
receive 100% oc cardiac output
Vendarsol
, What are the pressures within the lungs? - Correct Answer-
Pressures in the lungs are low
RV: 25 mmHg
Pulmonary artery: 14 mmHg
Capillaries: 10.4
Pulmonary veins: 9
(aortea has 90 mmHg)
Describe the mechanisms that allow for the pulmonary
vasculature to accommodate significant increases in blood
volume with minimal changes in blood pressure - Correct
Answer-Recruitment: previously closed capillaries near the
apex are opened to flow
Distension: open capillaries dilate
How do ventilation (V) and perfusion (Q) change as you
move from apex to the base of the lung? - Correct Answer-
Both ventilation and perfusion decrease from base to apex of
the lung
Ventilation decreases less sharply than perfusion, which
drops significantly due to gravity
PRACTICE:
Vendarsol
With 100% Correct And Verified Answers
How long does a RBC spend in a pulmonary capillary bed?
How many alveoli does it transverse in that time? - Correct
Answer-0.75 seconds
3 alveoli
Under normal circumstances how long will it take for
diffusion of O2 and CO2 to be complete in the alveoli? -
Correct Answer-0.25 seconds (after RBC moves past the
first alveolus)
Describe the path a RBC takes through the pulmonary
capillary network - Correct Answer-RV, pulmonary artery,
capillaries of 2 alveoli, pulmonary vein, LA
What are the 'relative amounts' of flow within the lungs? -
Correct Answer-Blood flow in the lungs is high, as the lungs
receive 100% oc cardiac output
Vendarsol
, What are the pressures within the lungs? - Correct Answer-
Pressures in the lungs are low
RV: 25 mmHg
Pulmonary artery: 14 mmHg
Capillaries: 10.4
Pulmonary veins: 9
(aortea has 90 mmHg)
Describe the mechanisms that allow for the pulmonary
vasculature to accommodate significant increases in blood
volume with minimal changes in blood pressure - Correct
Answer-Recruitment: previously closed capillaries near the
apex are opened to flow
Distension: open capillaries dilate
How do ventilation (V) and perfusion (Q) change as you
move from apex to the base of the lung? - Correct Answer-
Both ventilation and perfusion decrease from base to apex of
the lung
Ventilation decreases less sharply than perfusion, which
drops significantly due to gravity
PRACTICE:
Vendarsol
