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In humans, blood passes from the post caval to the diastolic right atrium of the heart due to:

  1. A
    Pressure difference between the post caval and atrium
  2. B
    Pushing open of the venous valves
  3. C
    Suction pull
  4. D
    Stimulation of the sino-auricular node

Solution & Step-by-step Explanation

Blood flow in the circulatory system is always driven by a pressure gradient. During atrial diastole, the pressure in the right atrium is lower than the pressure in the vena cava (post caval), allowing blood to flow into the heart.

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In humans, blood passes from the post caval to the diastolic right atrium of the heart due to:
A
Pressure difference between the post caval and atrium
B
Pushing open of the venous valves
C
Suction pull
D
Stimulation of the sino-auricular node

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Human PhysiologyBody Fluids and CirculationHeart

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