Question 1

Which of the following best describes the function of the fibrous pericardium?

Accepted Answer

It anchors the heart to surrounding structures and prevents overfilling with blood.

Question 2

A patient presents with pericardial effusion, where fluid accumulates in the pericardial cavity. What is the most immediate physiological risk associated with this condition?

Accepted Answer

Compression of the heart, impairing its ability to pump blood (cardiac tamponade)

Question 3

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

Accepted Answer

Myocardium

Question 4

The right atrium receives blood from all of the following EXCEPT:

Accepted Answer

Pulmonary veins

Question 5

Which of the following best explains why the left ventricular wall is thicker than the right?

Accepted Answer

It pumps blood through the entire body, requiring greater force.

Question 6

During the cardiac cycle, which event is responsible for the first heart sound (S1)?

Accepted Answer

Closing of the atrioventricular (AV) valves

Question 7

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

Accepted Answer

Anterior wall of the left ventricle

Question 8

Which of the following correctly traces the pathway of blood through the heart and lungs?

Accepted Answer

Right atrium $$\rightarrow$$ right ventricle $$\rightarrow$$ pulmonary arteries $$\rightarrow$$ lungs $$\rightarrow$$ pulmonary veins $$\rightarrow$$ left atrium $$\rightarrow$$ left ventricle $$\rightarrow$$ aorta

Question 9

Which of the following statements about heart valves is TRUE?

Accepted Answer

The pulmonary semilunar valve prevents backflow into the right ventricle.

Question 10

A patient with a stiffened mitral valve due to calcification is likely to experience which of the following?

Accepted Answer

Increased backflow of blood into the left atrium during ventricular contraction

Question 11

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

Accepted Answer

They anchor the AV valve flaps to papillary muscles, preventing valve prolapse.

Question 12

The Frank-Starling law of the heart states that:

Accepted Answer

The greater the stretch of cardiac muscle cells, the stronger the contraction, up to a physiological limit.

Question 13

Calculate the cardiac output (CO) if the heart rate (HR) is $$80$$ beats per minute and the stroke volume (SV) is $$70 mL $$per beat. Use the formula $$CO = HR 	imes SV.$$

Accepted Answer

$$5600 mL/$$min

Question 14

Which of the following would most likely cause a decrease in stroke volume?

Accepted Answer

Decreased end diastolic volume (EDV)

Question 15

A patient is experiencing tachycardia (heart rate over 100 beats/min). Which of the following is a potential consequence if this condition persists?

Accepted Answer

Decreased cardiac output due to reduced ventricular filling

Question 16

Which of the following best explains why the myocardium is arranged in a spiral pattern?

Accepted Answer

To enable a wringing motion that efficiently ejects blood from the ventricles

Question 17

Which of the following is TRUE regarding the conduction system of the heart?

Accepted Answer

The AV bundle is the only electrical connection between the atria and ventricles.

Question 18

A patient with hypocalcemia (low calcium ion concentration) is likely to experience which effect on the heart?

Accepted Answer

Depressed heart function

Question 19

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

Accepted Answer

They supply oxygenated blood to the myocardium primarily when the heart is relaxed.

Question 20

Which of the following statements about microscopic heart muscle anatomy is correct?

Accepted Answer

Cardiac muscle cells are striated, branched, and connected by intercalated discs.

Anatomy & Physiology of the Heart: Structure, Coverings, Vessels, and Function

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