Cardiac Cycle: Ventricular Diastole

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What is the first heart sound (S1) caused by?

Closure of the AV valves when ventricles contract at systole (correct)

Rapid filling of the ventricles at middle one third of diastole

Opening of the AV valves when ventricles relax at diastole

Closure of the aortic and pulmonary valves

What is the term for the period of relaxation in the cardiac cycle?

Heart beat

Diastole (correct)

Cardiac cycle

Systole

What happens to the semilunar valves during ventricular diastole?

They remain closed due to higher pressure in the large arteries (correct)

They open to allow blood to enter the ventricles

They start to contract to pump blood out of the ventricles

They start to relax to allow blood to flow back into the atria

What is the primary function of the isovolumetric contraction phase?

To close the AV valves Signup and view all the answers

What happens to the intraventricular pressure during isovolumetric relaxation?

It falls due to the relaxation of the ventricles Signup and view all the answers

What is the maximum pressure in the left ventricle during systole?

120 mm Hg Signup and view all the answers

What happens to the pressure in the ventricular cavities during the isovolumetric contraction phase?

It rises but remains less than that in the large arteries Signup and view all the answers

What is the second heart sound (S2) caused by?

Closure of the aortic and pulmonary valves when ventricles relax at diastole Signup and view all the answers

During what phase of the cardiac cycle is the third heart sound (S3) produced?

At middle one third of diastole Signup and view all the answers

What is the duration of the cardiac cycle?

0.8 sec Signup and view all the answers

What is the minimum pressure required in the left ventricle to open the aortic valves?

120 mm Hg Signup and view all the answers

What is the pressure in the left ventricle at the end of rapid inflow?

2-4 mm Hg Signup and view all the answers

What happens to the AV valves during ventricular diastole?

They close to prevent backflow of blood into the atria Signup and view all the answers

What is the fourth heart sound (S4) associated with?

Atrial contraction Signup and view all the answers

What happens to the semilunar valves during the isovolumetric contraction phase?

They remain closed to prevent blood from flowing out of the ventricles Signup and view all the answers

What is the minimum pressure in the right ventricle during diastole?

2 mm Hg Signup and view all the answers

In what type of heart is the fourth heart sound (S4) commonly heard?

All of the above Signup and view all the answers

What characterizes the maximum ejection phase?

Ventricular pressure is greater than that in the large arteries Signup and view all the answers

What is the pressure in the right ventricle at the end of rapid inflow?

0-2 mm Hg Signup and view all the answers

What is the term for the period of contraction in the cardiac cycle?

Systole Signup and view all the answers

What type of sound is the first heart sound (S1) described as?

Soft and low-pitched Signup and view all the answers

What is the maximum pressure in the pulmonary artery during systole?

25 mm Hg Signup and view all the answers

What happens to the blood in the aorta and pulmonary artery during the ventricular diastole phase?

It tends to move back into the ventricles Signup and view all the answers

What happens during the reduced inflow phase of ventricular diastole?

Most of the blood has already entered the ventricles Signup and view all the answers

What is the duration of ventricular systole?

0.3 sec Signup and view all the answers

What marks the beginning of a new cardiac cycle?

The contraction of the atrial muscle fibers Signup and view all the answers

What is the primary function of the ventricular diastole phase?

To relax the ventricles and decrease the intraventricular pressure Signup and view all the answers

Why does the opening of a valve not produce a sound?

Because it is a slow-developing process Signup and view all the answers

What is the term for the spontaneous generation of an action potential in the cardiac cycle?

Sinus node Signup and view all the answers

During which phase of the cardiac cycle do the AV valves close?

Systole Signup and view all the answers

What is the purpose of the isovolumetric relaxation phase?

To relax the ventricles and decrease intraventricular pressure Signup and view all the answers

What happens to the intraventricular pressure during the reduced ejection phase?

It decreases, but is still higher than that in the aorta Signup and view all the answers

Cardiac Cycle: Ventricular Diastole

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Questions and Answers

What is the first heart sound (S1) caused by?

What is the term for the period of relaxation in the cardiac cycle?

What happens to the semilunar valves during ventricular diastole?

What is the primary function of the isovolumetric contraction phase?

What happens to the intraventricular pressure during isovolumetric relaxation?

What is the maximum pressure in the left ventricle during systole?

What happens to the pressure in the ventricular cavities during the isovolumetric contraction phase?

What is the second heart sound (S2) caused by?

During what phase of the cardiac cycle is the third heart sound (S3) produced?

What is the duration of the cardiac cycle?

What is the minimum pressure required in the left ventricle to open the aortic valves?

What is the pressure in the left ventricle at the end of rapid inflow?

What happens to the AV valves during ventricular diastole?

What is the fourth heart sound (S4) associated with?

What happens to the semilunar valves during the isovolumetric contraction phase?

What is the minimum pressure in the right ventricle during diastole?

In what type of heart is the fourth heart sound (S4) commonly heard?

What characterizes the maximum ejection phase?

What is the pressure in the right ventricle at the end of rapid inflow?

What is the term for the period of contraction in the cardiac cycle?

What type of sound is the first heart sound (S1) described as?

What is the maximum pressure in the pulmonary artery during systole?

What happens to the blood in the aorta and pulmonary artery during the ventricular diastole phase?

What happens during the reduced inflow phase of ventricular diastole?

What is the duration of ventricular systole?

What marks the beginning of a new cardiac cycle?

What is the primary function of the ventricular diastole phase?

Why does the opening of a valve not produce a sound?

What is the term for the spontaneous generation of an action potential in the cardiac cycle?

During which phase of the cardiac cycle do the AV valves close?

What is the purpose of the isovolumetric relaxation phase?

What happens to the intraventricular pressure during the reduced ejection phase?

What happens during the isovolumetric contraction phase?

What marks the beginning of the cardiac cycle?

What is the duration of the cardiac cycle?

During which phase of the cardiac cycle is Heart Sound 2 produced?

What is the sequence of heart sounds in the cardiac cycle?

What is the duration of ventricular diastole?

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