Cardiac Cycle Part 3 - Ejection, Isovolumetric Relaxation, and Filling

The video tutorial covers the cardiac cycle, focusing on phases like isovolumetric contraction, ejection, and relaxation. It explains how pressure changes in the heart chambers and vessels drive blood flow, and how these phases are represented in an EKG. The tutorial also discusses normal blood pressure values and their significance, concluding with the ventricular filling phase that resets the cycle.

What is the primary function of atrial systole in the cardiac cycle?

• To push blood into the ventricles

• To increase heart rate

• To relax the ventricles

• To open the aortic valve

During isovolumetric contraction, what happens to the volume of blood in the ventricles?

• It increases

• It fluctuates

• It decreases

• It remains the same

What triggers the opening of the aortic valve during the cardiac cycle?

• Decrease in ventricular volume

• Increase in ventricular pressure

• Increase in heart rate

• Decrease in atrial pressure

What is the significance of the rapid ejection phase?

• It closes the semilunar valves

• It rapidly decreases ventricular pressure

• It allows blood to fill the atria

• It quickly ejects blood into the arteries

What is considered normal blood pressure in millimeters of mercury?

• 100/60

• 110/70

• 140/90

• 120/80

How is stroke volume calculated?

• Blood pressure divided by heart rate

• End diastolic volume minus end systolic volume

• End systolic volume minus end diastolic volume

• Total blood volume divided by heart rate

What does the T wave on an EKG represent?

• Atrial repolarization

• Ventricular repolarization

• Ventricular depolarization

• Atrial depolarization

What occurs during isovolumetric relaxation?

• Ventricles contract

• Ventricles relax

• Atria contract

• Atria relax

What is the dicrotic notch?

• A sound made by the closing of the atrioventricular valves

• A brief increase in aortic pressure after valve closure

• A decrease in ventricular pressure

• A sound made by the opening of the semilunar valves

What marks the end of the isovolumetric relaxation phase?

• Closing of the semilunar valves

• Opening of the atrioventricular valves

• Closing of the atrioventricular valves

• Opening of the semilunar valves