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During ventricular diastole which is least likely to happen :/ Choose the incorrect option :


( A ) the ventricular pressure further declines the tricuspid and bicuspid valves are pushed open by the pressure in the atria exerted by the blood which was being emptied into them by the veins
( B ) none of the above
( C ) the ventricular pressure falls causing the closure of semilunar valves
( D ) closure of semilunar valves prevents the backflow of blood into the ventricles
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1 Answer

(B) is the right answer.

The ventricles now relax (ventricular diastole) and the ventricular pressure falls causing the closure of semilunar valves which prevents the backflow of blood into the ventricles. As the ventricular pressure declines further, the tricuspid and bicuspid valves are pushed open by the pressure in the atria exerted by the blood which was being emptied into them by the veins. The blood now once again moves freely to the ventricles. The ventricles and atria are now again in a relaxed (joint diastole) state, as earlier. Soon the SAN generates a new action potential and the events described above are repeated in that sequence and the process continues.
answered Apr 3, 2014 by pady_1
 
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