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Cardiac Cycle in Human Physiology Quiz

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During which phase of the cardiac cycle does the atria contract to push blood into the ventricles?

Diastole

Explanation

Atria contract during diastole to fill the ventricles.

What is the main function of the atrioventricular (AV) valves during the cardiac cycle?

To prevent backflow of blood into the atria during ventricular contraction

Explanation

AV valves prevent backflow into atria during ventricular contraction.

Which chamber of the heart receives oxygenated blood from the lungs?

Left atrium

Explanation

Left atrium receives oxygenated blood from the lungs.

What is the term for the relaxation phase of the cardiac cycle when the heart chambers fill with blood?

Diastole

Explanation

Relaxation phase when chambers fill is diastole.

Which of the following is NOT a phase of the cardiac cycle?

Ventricular relaxation

Explanation

Ventricular relaxation is not a phase; it's part of diastole.

What event occurs during the isovolumetric contraction phase of the cardiac cycle?

All heart valves are closed as pressure in the ventricles rises

Explanation

All heart valves are closed as ventricular pressure rises.

What is the role of the semilunar valves during the cardiac cycle?

To regulate blood flow from the ventricles into the arteries

Explanation

Semilunar valves regulate blood flow from ventricles to arteries.

Which chamber of the heart has the thickest muscular wall?

Left ventricle

Explanation

Left ventricle has the thickest muscular wall.

What is the term for the volume of blood pumped out by each ventricle in one minute?

Cardiac output

Explanation

Volume of blood pumped per ventricle per minute is cardiac output.

#10

Which of the following events occurs during the QRS complex on an electrocardiogram (ECG)?

Ventricular depolarization

Explanation

Ventricular depolarization occurs during the QRS complex.

#11

Which of the following statements about the Frank-Starling mechanism is true?

It ensures that the heart pumps out the same volume of blood it receives

Explanation

Frank-Starling mechanism ensures heart pumps received blood volume.

#12

Which of the following factors can affect preload, a determinant of stroke volume?

End-diastolic volume

Explanation

End-diastolic volume affects preload, determining stroke volume.

#13

What is the term for the phase of the cardiac cycle when the ventricles are actively pumping blood out of the heart?

Ventricular systole

Explanation

Phase when ventricles actively pump blood is ventricular systole.

#14

Which hormone is released by the kidneys to regulate blood pressure and stimulate red blood cell production?

Renin

Explanation

Kidneys release renin to regulate blood pressure and stimulate RBC production.

#15

Which of the following factors can lead to an increase in heart rate?

Increased blood pressure

Explanation

Increased blood pressure can lead to an increase in heart rate.

#16

Which of the following is a symptom of heart failure?

Tachypnea

Explanation

Tachypnea is a symptom of heart failure.

Cardiac Cycle in Human Physiology Quiz

During which phase of the cardiac cycle does the atria contract to push blood into the ventricles?

What is the main function of the atrioventricular (AV) valves during the cardiac cycle?

Which chamber of the heart receives oxygenated blood from the lungs?

What is the term for the relaxation phase of the cardiac cycle when the heart chambers fill with blood?

Which of the following is NOT a phase of the cardiac cycle?

What event occurs during the isovolumetric contraction phase of the cardiac cycle?

What is the role of the semilunar valves during the cardiac cycle?

Which chamber of the heart has the thickest muscular wall?

What is the term for the volume of blood pumped out by each ventricle in one minute?

Which of the following events occurs during the QRS complex on an electrocardiogram (ECG)?

Which of the following statements about the Frank-Starling mechanism is true?

Which of the following factors can affect preload, a determinant of stroke volume?

What is the term for the phase of the cardiac cycle when the ventricles are actively pumping blood out of the heart?

Which hormone is released by the kidneys to regulate blood pressure and stimulate red blood cell production?

Which of the following factors can lead to an increase in heart rate?

Which of the following is a symptom of heart failure?

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