In humans, blood passes from the post caval to the diastolic right atrium of heart due to
A. Stimulation of Sino auricular node
B. Pressure difference between the post caval & atrium
C. Pushing open of the venous valves
D. Suction pull
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How do parasympathetic neural signals affect the working of the heart?
A. Reduce both heart rate & cardiac output
B. Heart rate is increased without affecting cardiac output
C. Both the heart rate & cardiac output increase
D. Heart rate decreases but cardiac output increases
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