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Solution


Q.

Which one of the following statements is correct                [2022]
1 The atrio-ventricular node (AVN) generates an action potential to stimulate atrial contraction.  
2 The tricuspid and the bicuspid valves open due to the pressure exerted by the simultaneous contraction of the atria.  
3 Blood moves freely from atrium to the ventricle during joint diastole.  
4 Increased ventricular pressure causes closing of the semilunar valves.  

Ans.

(3)