Q7 (Cardiac Cycle)

Question 1

What are the four phases of the cardiac cycle?

Answer 1

1. Ventricular filling
2. Isovolumetric contraction
3. Ventricular ejection
4. Isovolumetric relaxation

Question 2

What occurs during ventricular filling?

Answer 2

1. Ventricles are filling with blood and are in diastole
2. Tricuspid and bicuspid valves are wide open
3. Atrial systole occurs
4. SLVs are closed

Question 3

What occurs during Isovolumetric contraction?

Answer 3

1. Ventricular systole starts
2. AVs & SLVs close when enough pressure builds in the ventricles
3. Atrial diastole begins

Question 4

What occurs during ventricular ejection?

Answer 4

1. Ventricular systole continues
2. AV valves are still closed
3. Atrial diastole continues
4. Pressure opens SLVs and blood is ejected into the pulmonary artery and aorta

Question 5

What occurs during Isovolumetric relaxation?

Answer 5

1. Ventricular diastole begins
2. AVs are still closed
3. Atrial diastole continues
4. SLVs close