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Cardiac Physiology and Regulation Quiz

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Which of the following is the primary pacemaker of the heart?

Sinoatrial (SA) node

Explanation

Initiates electrical impulses for heart contraction.

What is the term for the relaxation phase of the cardiac cycle?

Diastole

Explanation

Heart muscle relaxation allowing chambers to fill with blood.

Which type of blood vessel carries oxygenated blood away from the heart?

Artery

Explanation

Blood vessel transporting oxygenated blood from the heart.

Which of the following is NOT a component of the intrinsic conduction system of the heart?

Purkinje fibers

Explanation

Purkinje fibers are part of the conduction system.

What is the primary function of the coronary arteries?

Supply oxygen and nutrients to the heart muscle

Explanation

Blood vessels providing nutrients and oxygen to the heart.

What is the primary function of the atrioventricular (AV) valves in the heart?

Prevent backflow of blood into the atria

Explanation

Valves ensuring blood flows in one direction.

Which hormone is released during stress and increases heart rate and blood pressure?

Cortisol

Explanation

Stress hormone affecting cardiovascular function.

What is the Frank-Starling law of the heart related to?

Preload and stroke volume

Explanation

Heart's ability to adjust output based on venous return.

What is the term for the volume of blood ejected by the left ventricle in one minute?

Cardiac output

Explanation

Total blood pumped by the heart per minute.

#10

Which neurotransmitter is released by the vagus nerve to decrease heart rate?

Acetylcholine

Explanation

Neurotransmitter inhibiting heart rate via the vagus nerve.

#11

Which of the following is a function of the pericardium?

Protection of the heart

Explanation

Protective sac surrounding and supporting the heart.

#12

What is the primary purpose of the mitral valve (bicuspid valve) in the heart?

Prevent backflow of blood into the left atrium

Explanation

Ensures one-way flow from the left atrium to the left ventricle.

#13

What is the term for the volume of blood pumped out by one ventricle during each contraction?

Stroke volume

Explanation

Volume of blood expelled by the ventricle per beat.

#14

Which part of the autonomic nervous system is responsible for increasing heart rate and contractility?

Sympathetic nervous system

Explanation

Autonomic division stimulating heart activity.

#15

In the context of cardiac physiology, what does the term 'ischemia' refer to?

Insufficient blood flow to the heart muscle

Explanation

Reduced blood flow leading to inadequate oxygen supply.

#16

What is the term for the amount of blood returned to the heart during ventricular diastole?

Preload

Explanation

Volume of blood entering the heart during relaxation.

#17

Which of the following is a common symptom of myocardial infarction (heart attack)?

Chest pain or discomfort

Explanation

Characteristic pain indicating heart muscle damage.

#18

Which ion is primarily responsible for the depolarization phase in cardiac muscle cells?

Sodium (Na+)

Explanation

Key ion for initiating electrical signals in the heart.

#19

What is the term for the part of the electrocardiogram (ECG) that represents ventricular depolarization?

QRS complex

Explanation

ECG segment indicating ventricular contraction initiation.

#20

What is the primary function of the atrioventricular (AV) node in the heart?

Filter and delay electrical signals

Explanation

Delays electrical impulses for proper atrial-ventricular coordination.

#21

Which factor primarily determines preload in the heart?

End-diastolic volume

Explanation

Volume of blood in the ventricle before contraction.

#22

In the context of cardiac physiology, what does the term 'afterload' refer to?

Force opposing ventricular ejection

Explanation

Resistance ventricle faces during blood ejection.

#23

Which electrolyte imbalance can potentially lead to cardiac arrhythmias?

Hyperkalemia

Explanation

Excessive potassium levels affecting heart rhythm.

#24

What is the term for the volume of blood remaining in the ventricle after contraction?

End-systolic volume

Explanation

Blood volume left in the ventricle post-contraction.

#25

Which component of the cardiac conduction system is responsible for delaying the impulse before it reaches the ventricles?

Atrioventricular (AV) node

Explanation

Node slowing electrical impulses for proper ventricular coordination.

Cardiac Physiology and Regulation Quiz

Which of the following is the primary pacemaker of the heart?

What is the term for the relaxation phase of the cardiac cycle?

Which type of blood vessel carries oxygenated blood away from the heart?

Which of the following is NOT a component of the intrinsic conduction system of the heart?

What is the primary function of the coronary arteries?

What is the primary function of the atrioventricular (AV) valves in the heart?

Which hormone is released during stress and increases heart rate and blood pressure?

What is the Frank-Starling law of the heart related to?

What is the term for the volume of blood ejected by the left ventricle in one minute?

Which neurotransmitter is released by the vagus nerve to decrease heart rate?

Which of the following is a function of the pericardium?

What is the primary purpose of the mitral valve (bicuspid valve) in the heart?

What is the term for the volume of blood pumped out by one ventricle during each contraction?

Which part of the autonomic nervous system is responsible for increasing heart rate and contractility?

In the context of cardiac physiology, what does the term 'ischemia' refer to?

What is the term for the amount of blood returned to the heart during ventricular diastole?

Which of the following is a common symptom of myocardial infarction (heart attack)?

Which ion is primarily responsible for the depolarization phase in cardiac muscle cells?

What is the term for the part of the electrocardiogram (ECG) that represents ventricular depolarization?

What is the primary function of the atrioventricular (AV) node in the heart?

Which factor primarily determines preload in the heart?

In the context of cardiac physiology, what does the term 'afterload' refer to?

Which electrolyte imbalance can potentially lead to cardiac arrhythmias?

What is the term for the volume of blood remaining in the ventricle after contraction?

Which component of the cardiac conduction system is responsible for delaying the impulse before it reaches the ventricles?

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