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During atrial systole, the wave of contraction is stimulated by the
SA node
AV node
Bicuspid valve
Eustachian valve
Answers (1)
The stages of cardiac cycle
1. Atrial systole- In this step, there is a wave of contraction stimulated by the SA node. As a result of this the atria contract and blood is forced into the ventricles as the bicuspid and tricuspid valve are open
2. Atrial diastole- In this stage, the atrial systole ends and strial diastole begins
3. Beginning of ventricular systole- This step includes a wave of contraction that stimulated by AV node. This causes the ventricles to begin contracting . The bicuspid and tricuspid valves closes leading to appearance of first heart sound called Lubb
4. Complete ventricular systole- In this step, ventricles show complete contraction and as a result of this, blood flows into the pulmonary trunk and aorta as the semilunar valve is open
5. Beginning of ventricular diastole- In this step the ventricles begin to relax leading to closure of semilunar valve. This causes the second heart sound dub to appear
6. Complete ventricular diastole- In this stage of cardiac cycle, the pressure in the ventricles fall, the bicuspid and tricuspid valves open and blood flows from atria into the ventricles. This blood flow is facilitated because the pressure within the relaxed ventricles is lesser than that in atria and veins
As we learnt:
Atrial systole- In this step, there is a wave of contraction stimulated by the SA node. As a result of this the atria contract and blood is forced into the ventricles as the bicuspid and tricuspid valve are open. Hence, the correct answer is option a.
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