Cardiac Cycle Quiz

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

• To relax the ventricles

• To decrease blood pressure

• To open the aortic valve

• To push blood into the ventricles

During the ejection phase, what causes the aortic valve to open?

• Relaxation of the ventricles

• Contraction of the atria

• Decreased pressure in the aorta

• Increased pressure in the left ventricle

What is the normal range for systolic blood pressure?

• 100-120 mmHg

• 120-140 mmHg

• 80-100 mmHg

• 60-80 mmHg

What is the term for the amount of blood ejected from the heart during one stroke?

• Stroke volume

• Cardiac output

• End diastolic volume

• End systolic volume

What does the T wave on an EKG represent?

• Ventricular repolarization

• Atrial repolarization

• Ventricular depolarization

• Atrial depolarization

What happens to the aortic valve during isovolumetric relaxation?

• It opens

• It closes

• It remains partially closed

• It remains partially open

What is the dichrotic notch?

• A type of heart murmur

• A decrease in ventricular volume

• A brief increase in aortic pressure

• A sound made by the heart valves

What marks the end of the isovolumetric relaxation phase?

• Opening of the semilunar valves

• Closing of the semilunar valves

• Closing of the atrioventricular valves

• Opening of the atrioventricular valves

What is the primary event during ventricular filling?

• Passive flow of blood into the ventricles

• Relaxation of the atria

• Contraction of the ventricles

• Ejection of blood into the aorta

What is the significance of the pressure difference between the ventricles and the aorta during the cardiac cycle?

• It regulates the oxygen content in the blood

• It affects the electrical activity of the heart

• It influences the opening and closing of heart valves

• It determines the heart rate