Atrial Systole

Question 1

What is atrial systole?

Answer 1

Atrial systole is the phase of the cardiac cycle in which the atria contract to push blood into the ventricles.

Question 2

True or False: Atrial systole occurs after ventricular systole.

Answer 2

False

Question 3

Fill in the blank: Atrial systole contributes approximately ___% of the ventricular filling.

Answer 3

20

Question 4

What electrical event triggers atrial systole?

Answer 4

The depolarization of the atria, initiated by the sinoatrial (SA) node.

Question 5

During which phase of the cardiac cycle does atrial systole occur?

Answer 5

It occurs just before ventricular systole.

Question 6

Multiple Choice: Which valve opens to allow blood flow from the atria to the ventricles during atrial systole? A) Aortic valve B) Pulmonary valve C) Mitral valve D) Tricuspid valve

Answer 6

C) Mitral valve (for the left atrium) and D) Tricuspid valve (for the right atrium)

Question 7

What is the role of atrial systole in the cardiac cycle?

Answer 7

To ensure that the ventricles are adequately filled with blood before they contract.

Question 8

True or False: Atrial systole is responsible for the majority of blood flow into the ventricles.

Answer 8

False

Question 9

What happens to the pressure in the atria during atrial systole?

Answer 9

The pressure in the atria increases as they contract.

Question 10

What is the effect of atrial systole on the heart rate?

Answer 10

Atrial systole does not directly affect heart rate but is influenced by the heart rate set by the SA node.