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Physiology of the Cardiac Cycle Quiz

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

Left atrium

Explanation

Left atrium receives oxygenated blood from the lungs.

Which structure conducts the electrical impulses from the atria to the ventricles?

AV node

Explanation

AV node conducts electrical impulses from atria to ventricles.

What effect does the parasympathetic nervous system have on heart rate?

Decreases heart rate

Explanation

Parasympathetic nervous system decreases heart rate.

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

Aortic valve

Explanation

Aortic valve prevents backflow from aorta into left ventricle.

Which of the following valves prevents the backflow of blood from the pulmonary trunk into the right ventricle?

Pulmonary valve

Explanation

Pulmonary valve prevents backflow from pulmonary trunk into right ventricle.

Which of the following is responsible for the initiation of the cardiac action potential in the heart?

SA node

Explanation

SA node is responsible for initiating the cardiac action potential.

What is the term for the amount of blood ejected by the ventricle in one contraction?

Stroke volume

Explanation

Stroke volume is the amount of blood ejected by the ventricle in one contraction.

During which phase of the cardiac cycle does ventricular filling occur?

Ventricular diastole

Explanation

Ventricular filling occurs during Ventricular diastole.

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

Cardiac output

Explanation

Cardiac output is the volume of blood pumped out by each ventricle per minute.

#10

Which of the following hormones increases heart rate and contractility?

Epinephrine

Explanation

Epinephrine increases heart rate and contractility.

#11

Which of the following factors can increase preload, leading to an increase in stroke volume?

Increased blood volume

Explanation

Increased blood volume can increase preload, thus increasing stroke volume.

#12

Which of the following represents the correct sequence of events in the cardiac cycle?

Atrial systole, ventricular systole, ventricular diastole, isovolumetric contraction

Explanation

The correct sequence is atrial systole, ventricular systole, ventricular diastole, isovolumetric contraction.

#13

Which of the following ions plays a crucial role in the depolarization phase of cardiac action potential?

Sodium

Explanation

Sodium plays a crucial role in the depolarization phase of cardiac action potential.

#14

What is the term for the phase in the cardiac cycle when the atria are contracting and the ventricles are relaxed?

Atrial systole

Explanation

Atrial systole is when atria contract and ventricles relax.

#15

What is the term for the phase of the cardiac cycle when the ventricles are in a state of contraction and all valves are closed?

Isovolumetric contraction

Explanation

Isovolumetric contraction is when ventricles contract with closed valves.

#16

Which of the following factors can decrease afterload?

Narrowed arterioles

Explanation

Narrowed arterioles can decrease afterload.

#17

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

It explains how increased stretch of cardiac muscle fibers leads to increased contractile force.

Explanation

Frank-Starling mechanism explains how increased stretch leads to increased contractile force.

Physiology of the Cardiac Cycle Quiz

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

Which structure conducts the electrical impulses from the atria to the ventricles?

What effect does the parasympathetic nervous system have on heart rate?

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

Which of the following valves prevents the backflow of blood from the pulmonary trunk into the right ventricle?

Which of the following is responsible for the initiation of the cardiac action potential in the heart?

What is the term for the amount of blood ejected by the ventricle in one contraction?

During which phase of the cardiac cycle does ventricular filling occur?

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

Which of the following hormones increases heart rate and contractility?

Which of the following factors can increase preload, leading to an increase in stroke volume?

Which of the following represents the correct sequence of events in the cardiac cycle?

Which of the following ions plays a crucial role in the depolarization phase of cardiac action potential?

What is the term for the phase in the cardiac cycle when the atria are contracting and the ventricles are relaxed?

What is the term for the phase of the cardiac cycle when the ventricles are in a state of contraction and all valves are closed?

Which of the following factors can decrease afterload?

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

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