Which one of the following statements is corr | vedclass

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(B) During joint diastole,all four chambers of the heart are in a relaxed state. In this phase,the tricuspid and bicuspid valves are open,allowing blo

Vedclass · Accepted Answer

Blood moves freely from atrium to the ventricle during joint diastole.

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(B) During joint diastole,all four chambers of the heart are in a relaxed state. In this phase,the tricuspid and bicuspid valves are open,allowing blood to flow freely from the atria into the ventricles. Option $A$ is incorrect because the valves open due to the pressure gradient created by atrial relaxation and ventricular filling,not just contraction. Option $C$ is incorrect because increased ventricular pressure causes the closing of the atrioventricular valves,while the semilunar valves open. Option $D$ is incorrect because the $SA$ node,not the $AVN$,is the pacemaker that initiates the action potential for atrial contraction.

Which one of the following statements is correct?

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