In humans, blood passes from the post caval to the diastomic right atrium of heat due to

Options

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

Answer

B

Explanation

The movement of blood from post casual to right atrium is due to pressure difference i.e. from the region of high pressure (post caval) to low pressure (right atrium) by the process of diffusion.