NEET 2008 Biology question

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

(1)Pressure difference between the post caval and atriumCorrect
(2)Pushing open of the venous valves
(3)Suction pull
(4)Stimulation of the sino auricular node

Answer: (1)

Solution

During atrial diastole the right atrium is relaxed and its pressure falls below that in the post caval (inferior vena cava), so blood flows from the higher-pressure vein into the lower-pressure atrium. Hence option (1). Valves open

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Question ID VK-090091