Question 1

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

Accepted Answer

Myocardium

Question 2

A patient suffers a myocardial infarction (heart attack) that damages the left ventricle. Which of the following is the most likely consequence?

Accepted Answer

Reduced systemic circulation

Question 3

Which of the following best describes the function of the pericardial cavity?

Accepted Answer

It reduces friction between the heart and surrounding tissues.

Question 4

The right atrium receives blood from which of the following vessels?

Accepted Answer

Superior vena cava and inferior vena cava

Question 5

Which structure separates the right and left ventricles of the heart?

Accepted Answer

Interventricular septum

Question 6

A blockage in the left coronary artery would most directly affect which area of the heart?

Accepted Answer

Left ventricle

Question 7

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

Accepted Answer

It pumps blood to the entire body (systemic circuit).

Question 8

Which of the following is a unique feature of cardiac muscle tissue visible under the microscope?

Accepted Answer

Intercalated discs

Question 9

During the pulmonary circuit, which sequence correctly describes the flow of blood?

Accepted Answer

Right ventricle → pulmonary trunk → lungs → left atrium

Question 10

Which vessel carries oxygenated blood from the lungs to the heart?

Accepted Answer

Pulmonary vein

Question 11

If the tricuspid valve fails to close properly, which of the following is the most likely result?

Accepted Answer

Backflow of blood into the right atrium during ventricular contraction

Question 12

Which of the following best describes the function of the coronary arteries?

Accepted Answer

They supply oxygenated blood to the myocardium.

Question 13

A patient has a pericardial effusion, which is an abnormal accumulation of fluid in the pericardial cavity. What is the most likely effect on heart function?

Accepted Answer

Restricted heart movement and reduced cardiac output

Question 14

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 15

Which chamber of the heart receives oxygenated blood directly from the pulmonary veins?

Accepted Answer

Left atrium

Question 16

Which of the following best describes the path of blood flow through the systemic circuit?

Accepted Answer

Left ventricle → aorta → body tissues → right atrium

Question 17

Which of the following statements about the fibrous pericardium is correct?

Accepted Answer

It anchors the heart to surrounding structures such as the diaphragm.

Question 18

Which of the following is a function of the intercalated discs in cardiac muscle tissue?

Accepted Answer

They allow rapid transmission of electrical impulses between cells.

Question 19

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

Accepted Answer

Right ventricle

Question 20

Which of the following best explains why the interventricular septum is important for heart function?

Accepted Answer

It prevents mixing of oxygenated and deoxygenated blood between the ventricles.

Anatomy and Physiology of the Heart

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