Question

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

• A. stimulation of the sino-auricular node
• B. the pressure difference between the post caval and atrium
• C. pushing open of the venous valves
• D. suction pull

Answer 1

The correct option is B the pressure difference between the post caval and atrium

Due to the pressure difference between the post caval and atrium, the blood passes from the post caval to the diastolic right atrium. Diastolic right atrium has less pressure and post caval has high pressure, thus blood moves from post caval to right atrium.