Ventricular Systole Flashcards
What is ventricular systole?
Ventricular systole is the phase of the cardiac cycle during which the ventricles contract and pump blood out of the heart.
During ventricular systole, which valves are closed?
The atrioventricular (AV) valves are closed during ventricular systole.
True or False: Ventricular systole occurs after atrial systole.
True.
What is the primary function of ventricular systole?
The primary function of ventricular systole is to eject blood from the ventricles into the aorta and pulmonary artery.
Fill in the blank: The contraction of the ventricles during ventricular systole is initiated by __________.
the depolarization of the cardiac muscle cells.
What is the role of the semilunar valves during ventricular systole?
The semilunar valves open during ventricular systole to allow blood to flow into the aorta and pulmonary artery.
What phase follows ventricular systole in the cardiac cycle?
Ventricular diastole follows ventricular systole.
How does ventricular systole affect blood pressure in the arteries?
Ventricular systole increases blood pressure in the arteries as blood is pumped out of the heart.
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
C) Blood is ejected from the heart.
What electrical event triggers ventricular systole?
The action potential generated by the depolarization of the ventricles triggers ventricular systole.
True or False: Ventricular systole lasts longer than ventricular diastole.
False.
What is isovolumetric contraction?
Isovolumetric contraction is the phase of ventricular systole where the ventricles contract with no change in volume because all valves are closed.
Fill in the blank: The __________ node is responsible for initiating the electrical impulse that leads to ventricular systole.
sinoatrial (SA) node.
What happens to the ventricular pressure during systole?
The ventricular pressure rises sharply during systole.
What is the duration of ventricular systole in a typical heart cycle?
Ventricular systole typically lasts about 0.3 seconds.
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
C) Atrial filling.
How does ventricular systole contribute to overall cardiac output?
Ventricular systole is crucial for pumping blood into the systemic and pulmonary circulation, contributing to overall cardiac output.
True or False: Ventricular systole occurs simultaneously in both ventricles.
True.
What physiological changes occur in the heart during ventricular systole?
During ventricular systole, the heart muscles contract, increasing pressure in the ventricles and closing the AV valves.
Fill in the blank: The volume of blood pumped by each ventricle during one contraction is known as __________.
stroke volume.
What is the relationship between heart rate and ventricular systole?
An increase in heart rate typically leads to a decrease in the duration of ventricular systole.
Which part of the heart receives blood during ventricular systole?
The aorta and pulmonary artery receive blood during ventricular systole.
What is the significance of the pressure gradient during ventricular systole?
The pressure gradient during ventricular systole ensures that blood flows from the ventricles into the arteries.
What role does the autonomic nervous system play during ventricular systole?
The autonomic nervous system regulates heart rate and contractility during ventricular systole.
Fill in the blank: The __________ is the period of time when the heart muscle is fully contracted during ventricular systole.
systolic phase.
What can cause an increase in the strength of ventricular systole?
Increased sympathetic stimulation can enhance the strength of ventricular systole.
