1 which of these answers are correct the first heart sound...

Which of these answers are correct? The first heart sound, "lubb," is caused by the closing of the atrioventricular valves. The second heart sound, "dubb," is caused by the closing of the semilunar valves. Regurgitation of the atrioventricular valves does not cause a heart sound. Blood flowing into the ventricles does not cause a heart sound.

Which one of the following is responsible for generating the first heart sound? a) Opening of the atrioventricular (AV) valves b) Closing of the semilunar valves c) Closing of the atrioventricular (AV) valves d) Opening of the semilunar valves In the electrocardiogram (ECG) of a normal cardiac cycle, the wave called T corresponds to: a) Depolarization of the atria. b) Repolarization of the atria. c) Depolarization of the ventricles. d) Repolarization of the ventricles. e) More than one of the above The cardiac cycle has two phases: Diastole, in which the ventricles relax; and systole, in which the ventricles contract. Systole, in which the ventricles contract; and diastole, in which the ventricles relax. Systole, in which the atria contract; and diastole, in which the ventricles contract. Diastole, in which the atria relax; and systole, in which the ventricles relax. Systole, in which the atria relax; and diastole, in which the atria contract.

Madhur L.

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