Question 1

Which of the following best describes the function of the septum in the heart?

Accepted Answer

It prevents the mixing of oxygenated and deoxygenated blood between the left and right sides of the heart.

Question 2

During which phase of the cardiac cycle does blood flow through the coronary arteries primarily occur?

Accepted Answer

During ventricular diastole

Question 3

Which structure is responsible for anchoring the atrioventricular (AV) valves and preventing their inversion during ventricular contraction?

Accepted Answer

Chordae tendineae

Question 4

What is the primary difference between pulmonary and systemic circulation?

Accepted Answer

Pulmonary circulation carries deoxygenated blood to the lungs and returns oxygenated blood to the heart, while systemic circulation delivers oxygenated blood to the body and returns deoxygenated blood to the heart.

Question 5

Which of the following statements about cardiac muscle cells is TRUE?

Accepted Answer

They are connected by intercalated discs containing gap junctions and desmosomes.

Question 6

Which type of cardiac cell is responsible for generating the pacemaker potential and initiating the heartbeat?

Accepted Answer

Autorhythmic cells

Question 7

A patient has a blockage in the right coronary artery. Which area of the heart is most likely to be affected first?

Accepted Answer

The right atrium and right ventricle

Question 8

Which of the following best explains why gap junctions are essential for cardiac muscle function?

Accepted Answer

They allow rapid spread of action potentials, enabling coordinated contraction of the heart chambers.

Question 9

If the sinoatrial (SA) node fails to function, which structure will most likely take over as the pacemaker of the heart?

Accepted Answer

Atrioventricular (AV) node

Question 10

Which of the following equations correctly represents the relationship between cardiac output (CO), heart rate (HR), and stroke volume (SV)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 11

A patient is experiencing backflow of blood from the left ventricle into the left atrium during ventricular contraction. Which valve is most likely malfunctioning?

Accepted Answer

Bicuspid (mitral) valve

Question 12

Which of the following best describes the role of the AV node in the cardiac conduction system?

Accepted Answer

It delays the electrical impulse, allowing the atria to contract before the ventricles.

Question 13

Which of the following is a key difference between skeletal and cardiac muscle cells?

Accepted Answer

Cardiac muscle cells are branched and connected by intercalated discs, while skeletal muscle cells are long and multinucleated.

Question 14

Which of the following best explains why the heart cannot undergo tetanus like skeletal muscle?

Accepted Answer

The action potential duration in cardiac muscle is nearly as long as the contraction, preventing summation.

Question 15

Which of the following is the correct sequence of structures that an action potential travels through in the cardiac conduction system?

Accepted Answer

SA node → AV node → Bundle of His → Purkinje fibers

Question 16

Which of the following best describes the function of the pulmonary veins?

Accepted Answer

They carry oxygenated blood from the lungs to the left atrium.

Question 17

A patient with a mutation that disrupts gap junctions in cardiac muscle would most likely experience which of the following?

Accepted Answer

Impaired electrical conduction and uncoordinated heart contractions

Question 18

Which of the following statements about the cardiac cycle is correct?

Accepted Answer

Atria contract as a unit, followed by the ventricles contracting as a unit.

Question 19

Which of the following best describes the role of the aorta in the cardiovascular system?

Accepted Answer

It carries oxygenated blood from the left ventricle to the systemic circulation.

Question 20

Which of the following is a real-life consequence of a failure in the AV valves?

Accepted Answer

Blood regurgitation from the ventricles to the atria, leading to reduced cardiac efficiency and possible heart failure.

Cardiovascular Physiology: Structure and Function of the Heart

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