Ventricular Systole

Question 1

What is ventricular systole?

Answer 1

Ventricular systole is the phase of the cardiac cycle during which the ventricles contract and pump blood out of the heart.

Question 2

During ventricular systole, which valves are closed?

Answer 2

The atrioventricular (AV) valves are closed during ventricular systole.

Question 3

True or False: Ventricular systole occurs after atrial systole.

Answer 3

True.

Question 4

What is the primary function of ventricular systole?

Answer 4

The primary function of ventricular systole is to eject blood from the ventricles into the aorta and pulmonary artery.

Question 5

Fill in the blank: The contraction of the ventricles during ventricular systole is initiated by __________.

Answer 5

the depolarization of the cardiac muscle cells.

Question 6

What is the role of the semilunar valves during ventricular systole?

Answer 6

The semilunar valves open during ventricular systole to allow blood to flow into the aorta and pulmonary artery.

Question 7

What phase follows ventricular systole in the cardiac cycle?

Answer 7

Ventricular diastole follows ventricular systole.

Question 8

How does ventricular systole affect blood pressure in the arteries?

Answer 8

Ventricular systole increases blood pressure in the arteries as blood is pumped out of the heart.

Question 9

Multiple Choice: Which of the following occurs during ventricular systole? A) Atria contract B) Ventricles fill with blood C) Blood is ejected from the heart D) Heart is in diastole

Answer 9

C) Blood is ejected from the heart.

Question 10

What electrical event triggers ventricular systole?

Answer 10

The action potential generated by the depolarization of the ventricles triggers ventricular systole.

Question 11

True or False: Ventricular systole lasts longer than ventricular diastole.

Answer 11

False.

Question 12

What is isovolumetric contraction?

Answer 12

Isovolumetric contraction is the phase of ventricular systole where the ventricles contract with no change in volume because all valves are closed.

Question 13

Fill in the blank: The __________ node is responsible for initiating the electrical impulse that leads to ventricular systole.

Answer 13

sinoatrial (SA) node.

Question 14

What happens to the ventricular pressure during systole?

Answer 14

The ventricular pressure rises sharply during systole.

Question 15

What is the duration of ventricular systole in a typical heart cycle?

Answer 15

Ventricular systole typically lasts about 0.3 seconds.

Question 16

Multiple Choice: Which of the following is NOT a phase of ventricular systole? A) Isovolumetric contraction B) Ejection phase C) Atrial filling D) Rapid ejection

Answer 16

C) Atrial filling.

Question 17

How does ventricular systole contribute to overall cardiac output?

Answer 17

Ventricular systole is crucial for pumping blood into the systemic and pulmonary circulation, contributing to overall cardiac output.

Question 18

True or False: Ventricular systole occurs simultaneously in both ventricles.

Answer 18

True.

Question 19

What physiological changes occur in the heart during ventricular systole?

Answer 19

During ventricular systole, the heart muscles contract, increasing pressure in the ventricles and closing the AV valves.

Question 20

Fill in the blank: The volume of blood pumped by each ventricle during one contraction is known as __________.

Answer 20

stroke volume.

Question 21

What is the relationship between heart rate and ventricular systole?

Answer 21

An increase in heart rate typically leads to a decrease in the duration of ventricular systole.

Question 22

Which part of the heart receives blood during ventricular systole?

Answer 22

The aorta and pulmonary artery receive blood during ventricular systole.

Question 23

What is the significance of the pressure gradient during ventricular systole?

Answer 23

The pressure gradient during ventricular systole ensures that blood flows from the ventricles into the arteries.

Question 24

What role does the autonomic nervous system play during ventricular systole?

Answer 24

The autonomic nervous system regulates heart rate and contractility during ventricular systole.

Question 25

Fill in the blank: The __________ is the period of time when the heart muscle is fully contracted during ventricular systole.

Answer 25

systolic phase.

Question 26

What can cause an increase in the strength of ventricular systole?

Answer 26

Increased sympathetic stimulation can enhance the strength of ventricular systole.