Frequently Asked MCQ quiz on the Cardiac Cycle Questions with Answers – MCQ Quiz for Competitive Exam Preparation – These questions given will be useful for competitive exams preparation. We will be updating more mcq regularly, please follow our website regularly.

What is the primary function of the cardiac cycle?

a) Transport of oxygen to tissues

b) Regulation of blood pressure

c) Circulation of blood throughout the body

d) Pumping blood through the heart

Answer: d) Pumping blood through the heart

During which phase of the cardiac cycle does the heart relax and fill with blood?

a) Diastole

b) Systole

c) Atrial contraction

d) Ventricular contraction

Answer: a) Diastole

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Which chamber of the heart contracts first during the cardiac cycle?

a) Left atrium

b) Right atrium

c) Left ventricle

d) Right ventricle

Answer: b) Right atrium

What is the term for the volume of blood ejected from the ventricle with each heartbeat?

a) Cardiac output

b) Stroke volume

c) Ejection fraction

d) End-diastolic volume

Answer: b) Stroke volume

Which valve prevents the backflow of blood from the left ventricle into the left atrium?

a) Aortic valve

b) Mitral valve (bicuspid valve)

c) Pulmonary valve

d) Tricuspid valve

Answer: b) Mitral valve (bicuspid valve)

During which phase of the cardiac cycle does blood enter the atria from the venae cavae and pulmonary veins?

a) Ventricular systole

b) Ventricular diastole

c) Atrial systole

d) Atrial diastole

Answer: d) Atrial diastole

What is the term for the volume of blood in the ventricle at the end of diastole?

a) Stroke volume

b) Cardiac output

c) End-diastolic volume

d) Ejection fraction

Answer: c) End-diastolic volume

Which phase of the cardiac cycle is responsible for the “lub” sound of the heartbeat?

a) Atrial contraction

b) Ventricular contraction

c) Atrial relaxation

d) Ventricular relaxation

Answer: b) Ventricular contraction

What is the term for the period of time during which the ventricles are contracting and pumping blood?

a) Diastole

b) Systole

c) Ejection fraction

d) Cardiac output

Answer: b) Systole

Which structure conducts electrical impulses throughout the heart, coordinating its contractions?

a) Sinoatrial (SA) node

b) Atrioventricular (AV) node

c) Bundle of His

d) Purkinje fibers

Answer: d) Purkinje fibers

What is the term for the maximum volume of blood that the ventricles can eject during systole?

a) End-diastolic volume

b) Stroke volume

c) Cardiac output

d) Ejection fraction

Answer: b) Stroke volume

Which phase of the cardiac cycle is characterized by the contraction of the ventricles, leading to the ejection of blood into the arteries?

a) Diastole

b) Systole

c) Atrial contraction

d) Atrial relaxation

Answer: b) Systole

Which valve prevents the backflow of blood from the left ventricle into the aorta?

a) Aortic valve

b) Mitral valve (bicuspid valve)

c) Pulmonary valve

d) Tricuspid valve

Answer: a) Aortic valve

What is the term for the proportion of blood ejected from the ventricle with each contraction, expressed as a percentage?

a) Cardiac output

b) Stroke volume

c) Ejection fraction

d) End-diastolic volume

Answer: c) Ejection fraction

Which node in the heart initiates the electrical impulse that triggers each heartbeat?

a) Sinoatrial (SA) node

b) Atrioventricular (AV) node

c) Bundle of His

d) Purkinje fibers

Answer: a) Sinoatrial (SA) node

Which phase of the cardiac cycle is characterized by the relaxation of the ventricles and filling with blood?

a) Diastole

b) Systole

c) Atrial contraction

d) Atrial relaxation

Answer: a) Diastole

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

a) Left atrium

b) Right atrium

c) Left ventricle

d) Right ventricle

Answer: a) Left atrium

Which valve prevents the backflow of blood from the right ventricle into the right atrium?

a) Aortic valve

b) Mitral valve (bicuspid valve)

c) Pulmonary valve

d) Tricuspid valve

Answer: d) Tricuspid valve

What is the term for the volume of blood pumped by the heart per minute?

a) Stroke volume

b) Cardiac output

c) Ejection fraction

d) End-diastolic volume

Answer: b) Cardiac output

Which structure delays the transmission of electrical impulses from the atria to the ventricles, allowing time for atrial contraction?

a) Sinoatrial (SA) node

b) Atrioventricular (AV) node

c) Bundle of His

d) Purkinje fibers

Answer: b) Atrioventricular (AV) node

What is the term for the minimum volume of blood in the ventricle at the end of systole?

a) Stroke volume

b) Cardiac output

c) End-diastolic volume

d) Ejection fraction

Answer: c) End-diastolic volume

During which phase of the cardiac cycle do the atria contract and push blood into the ventricles?

a) Ventricular systole

b) Ventricular diastole

c) Atrial systole

d) Atrial diastole

Answer: c) Atrial systole

Which valve separates the right ventricle from the pulmonary artery?

a) Aortic valve

b) Mitral valve (bicuspid valve)

c) Pulmonary valve

d) Tricuspid valve

Answer: c) Pulmonary valve

What is the term for the period of time during which the ventricles are relaxing and filling with blood?

a) Diastole

b) Systole

c) Ejection fraction

d) Cardiac output

Answer: a) Diastole

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