NEET2022ZoologyBody Fluids and CirculationActual
Which one of the following statements is correct?
Options
- AThe tricuspid and the bicuspid valves open due to the pressure exerted by the simultaneous contraction of the
- BBlood moves freely from atrium to the ventricle during joint diastole
- CIncreased ventricular pressure causes closing of the semilunar valves
- DThe atrio-ventricular node (AVN) generates an action potential to stimulate atrial contraction
Correct answer
B. Blood moves freely from atrium to the ventricle during joint diastole
Step-by-step solution
Contraction of heart chambers is called systole and relaxation is called diastole. Atria and ventricles contract alternately. Right atrium receives deoxygenated blood and left atrium receives oxygenated blood. When both the atria are completely filled with blood, pressure is exerted on the wall due to which SA node gets excited and generates cardiac impulse. This leads to atrial systole. During atrial systole, blood is pumped into ventricles. The opening between the right atrium and the right ventricle is guarded b