Question 1

Which of the following best describes the function of the pulmonary circuit in the heart?

Accepted Answer

It pumps oxygen-poor blood to the lungs to eliminate CO$$_2$$ and pick up O$$_2.$$

Question 2

A patient presents with inflammation of the pericardium and a creaking sound heard with a stethoscope. What is the most likely diagnosis?

Accepted Answer

Pericarditis

Question 3

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

Accepted Answer

Myocardium

Question 4

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

Accepted Answer

Interventricular septum and anterior ventricular walls

Question 5

Which of the following is a correct sequence of blood flow through the heart starting from the right atrium?

Accepted Answer

Right atrium → Tricuspid valve → Right ventricle → Pulmonary semilunar valve → Pulmonary trunk

Question 6

Which structure anchors the cusps of the atrioventricular (AV) valves to the papillary muscles?

Accepted Answer

Chordae tendineae

Question 7

A patient with a defective mitral valve is most likely to experience which of the following complications?

Accepted Answer

Backflow of blood into the left atrium during ventricular contraction

Question 8

Which of the following statements about the heart chambers is TRUE?

Accepted Answer

The left ventricle is more muscular than the right ventricle.

Question 9

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 systemic circuit, which is a long, high-friction circulation.

Question 10

Which of the following is a function of the cardiac skeleton?

Accepted Answer

It anchors cardiac muscle fibers and supports great vessels and valves.

Question 11

A patient is diagnosed with cardiac tamponade. What is the immediate physiological threat posed by this condition?

Accepted Answer

Compression of the heart's pumping ability due to excess fluid in the pericardial space

Question 12

Which of the following statements about cardiac muscle is correct?

Accepted Answer

Cardiac muscle cells are striated, branched, and contain numerous large mitochondria.

Question 13

Which of the following best describes the role of gap junctions in cardiac muscle?

Accepted Answer

They allow ions to pass from cell to cell, enabling the heart to function as a syncytium.

Question 14

Which of the following is TRUE regarding the difference between cardiac and skeletal muscle contraction?

Accepted Answer

Cardiac muscle can contract without nervous system stimulation due to pacemaker cells.

Question 15

A sample of muscle tissue is found to require both Ca$$^{2+}$$ and ATP for contraction, uses glucose as a predominant fuel, generates ATP mainly by anaerobic metabolism, and contains very few mitochondria. What type of muscle is this most likely to be?

Accepted Answer

Skeletal muscle

Question 16

Which of the following best explains why tetanic contractions cannot occur in cardiac muscle?

Accepted Answer

Cardiac muscle fibers have a longer absolute refractory period than skeletal muscle fibers.

Question 17

Which of the following is a unique feature of the left atrium compared to the right atrium?

Accepted Answer

It receives oxygenated blood from the lungs via four pulmonary veins.

Question 18

Which of the following statements about the coronary circulation is correct?

Accepted Answer

The left ventricle receives most of the coronary blood supply.

Question 19

Which of the following best describes the function of the semilunar valves?

Accepted Answer

They prevent backflow of blood from the major arteries into the ventricles.

Anatomy & Physiology: The Cardiovascular System – The Heart (Chapter 17 Part A Study Notes)

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