Question 1

Which of the following best describes the primary function of the heart valves?

Accepted Answer

To ensure unidirectional blood flow through the heart

Question 2

Blood returning from the systemic circuit enters the heart through which vessel?

Accepted Answer

Venae cavae

Question 3

Which chamber of the heart has the thickest wall, and why?

Accepted Answer

Left ventricle, because it pumps blood to the entire body

Question 4

What is the 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 → lungs

Question 5

Which valve prevents backflow of blood into the left ventricle?

Accepted Answer

Aortic semilunar valve

Question 6

During ventricular contraction, which event occurs to prevent the atrioventricular (AV) valves from inverting into the atria?

Accepted Answer

The chordae tendineae tighten as papillary muscles contract

Question 7

Which of the following statements about the pulmonary circuit is correct?

Accepted Answer

It is a short, low-pressure circuit

Question 8

A patient has a damaged mitral (bicuspid) valve. Which of the following is a likely consequence?

Accepted Answer

Backflow of blood into the left atrium during ventricular contraction

Question 9

Which vessel carries oxygen-rich blood from the lungs to the heart?

Accepted Answer

Pulmonary veins

Question 10

If the left ventricle fails to pump effectively, which of the following is a likely result?

Accepted Answer

Blood backs up into the pulmonary circulation, causing pulmonary edema

Question 11

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

Accepted Answer

It must generate more force to overcome greater resistance in the systemic circuit

Question 12

Which of the following equations best represents the relationship between pressure, flow, and resistance in the systemic circuit?

Accepted Answer

$$Q = \frac{\Delta P}{R}$$

Question 13

Which structure anchors the AV valve cusps to the papillary muscles?

Accepted Answer

Chordae tendineae

Question 14

A blockage in the pulmonary trunk would directly affect which of the following?

Accepted Answer

Blood flow from the right ventricle to the lungs

Question 15

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

Accepted Answer

Prevent backflow into the ventricles

Question 16

During which phase of the cardiac cycle are the AV valves open and the semilunar valves closed?

Accepted Answer

Atrial contraction and ventricular filling

Question 17

Which of the following is the correct order of structures that blood passes through as it moves from the left atrium to the aorta?

Accepted Answer

Left atrium → mitral valve → left ventricle → aortic semilunar valve → aorta

Question 18

Which of the following best explains why equal volumes of blood are pumped to the pulmonary and systemic circuits?

Accepted Answer

To prevent fluid accumulation in either circuit

Question 19

A patient with a defective aortic semilunar valve is likely to experience which of the following?

Accepted Answer

Backflow of blood into the left ventricle during ventricular relaxation

Question 20

Which of the following best describes the role of the papillary muscles during ventricular contraction?

Accepted Answer

They contract to prevent the AV valves from inverting

The Heart: Structure, Blood Flow, and Valves

Study Guide - Practice Questions