Question

In human, blood passes from the post caval to the diastolic right atrium of heart due to A)pushing open of the venous valves B)suction pull C)stimulation of the SA node D)pressure difference between the post caval & atrium

Answer 1

(b) Pressure difference between post caval and atrium 

Answer 2

 D) Pressure difference between the post Caval & Atrium.
Is The Answer....................