Q: Which of the following equations correctly represents cardiac output ($$CO$$)?

$$CO = Stroke\ Volume \times Heart\ Rate$$

Question 1

Which of the following best describes the function of the pulmonary circuit in the cardiovascular system?

Accepted Answer

It receives oxygen-poor blood from the body and pumps it to the lungs for gas exchange.

Question 2

Which heart chamber receives oxygen-rich blood from the lungs?

Accepted Answer

Left atrium

Question 3

A patient has a defect in the interventricular septum. Which of the following is a likely consequence?

Accepted Answer

Mixing of oxygen-rich and oxygen-poor blood between the ventricles

Question 4

Which layer of the heart wall is responsible for the contractile force that pumps blood?

Accepted Answer

Myocardium

Question 5

The mitral valve prevents backflow of blood into which chamber?

Accepted Answer

Left atrium

Question 6

Which of the following best explains why the left ventricle has a thicker wall than the right ventricle?

Accepted Answer

It pumps blood with greater force to the systemic circuit.

Question 7

During ventricular systole, which valves are open and which are closed?

Accepted Answer

Atrioventricular valves are closed; semilunar valves are open.

Question 8

Which structure acts as the heart’s natural pacemaker, initiating the electrical impulse for contraction?

Accepted Answer

Sinoatrial (SA) node

Question 9

A blockage in the left anterior descending artery (LAD) would most directly affect which region of the heart?

Accepted Answer

Anterior wall of the left ventricle

Question 10

Which of the following best describes the role of the cardiac skeleton?

Accepted Answer

It anchors valve cusps and blocks direct spread of electrical impulses.

Question 11

Which of the following is a direct effect of sympathetic stimulation on the heart?

Accepted Answer

Increased heart rate and force of contraction

Question 12

A patient presents with chest pain due to atherosclerosis in the coronary arteries. What is the most likely diagnosis?

Accepted Answer

Angina pectoris

Question 13

Which of the following best explains the function of the chordae tendineae?

Accepted Answer

They prevent the atrioventricular valve flaps from everting into the atria during ventricular contraction.

Question 14

Which of the following congenital heart defects results in the mixing of oxygenated and deoxygenated blood due to a failure of the interventricular septum to form?

Accepted Answer

Ventricular septal defect

Question 15

Which of the following best describes the sequence of electrical conduction through the heart?

Accepted Answer

SA node → AV node → AV bundle → bundle branches → Purkinje fibers

Question 16

Which of the following equations correctly represents cardiac output ($$CO$$)?

Accepted Answer

$$CO = Stroke\ Volume 	imes Heart\ Rate$$

Question 17

Which of the following is a characteristic unique to cardiac muscle cells compared to skeletal muscle cells?

Accepted Answer

They are joined by intercalated discs containing gap junctions and fasciae adherens.

Question 18

A patient with atrial fibrillation is at increased risk for which of the following complications?

Accepted Answer

Stroke due to clot formation

Question 19

Which of the following best describes the effect of the vagus nerve on the heart?

Accepted Answer

It decreases heart rate by acting on the SA and AV nodes.

Question 20

Which of the following statements about the pericardium is correct?

Accepted Answer

The visceral layer of the serous pericardium is also known as the epicardium.

The Cardiovascular System: Heart Anatomy and Physiology

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