Question 1

Which of the following best describes the function of the right side of the heart in the mammalian cardiovascular system?

Accepted Answer

It pumps deoxygenated blood to the pulmonary circuit.

Question 2

In the diagrams of mammalian circulatory systems, what is the primary difference between the pulmonary and systemic circuits?

Accepted Answer

Pulmonary circuit carries deoxygenated blood to the lungs, while systemic circuit carries oxygenated blood to the body.

Question 3

Which anatomical structure anchors the heart to the diaphragm and sternum, providing stability within the thoracic cavity?

Accepted Answer

Fibrous pericardium

Question 4

What is the main function of the pericardial fluid found within the pericardial cavity?

Accepted Answer

To lubricate the heart and reduce friction during contractions

Question 5

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

Accepted Answer

Myocardium

Question 6

Why is the wall of the left ventricle significantly thicker than that of the right ventricle?

Accepted Answer

It must generate higher pressure to pump blood throughout the systemic circuit.

Question 7

Which of the following best explains the role of the fibrous skeleton of the heart?

Accepted Answer

It provides structural support and electrical insulation between atria and ventricles.

Question 8

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

Accepted Answer

AV valves are closed; semilunar valves are open.

Question 9

Which equation best represents the relationship between cardiac output ($$CO$$), heart rate ($$HR$$), and stroke volume ($$SV$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 10

A patient experiences chest pain due to partial blockage of a coronary artery. What is the most likely physiological cause of this pain?

Accepted Answer

Ischemia leading to hypoxia and glucose starvation in cardiomyocytes

Question 11

Which of the following statements about coronary circulation is correct?

Accepted Answer

Coronary arteries are compressed during systole, so most blood flow occurs during diastole.

Question 12

Which hormone is released by the atria in response to increased ventricular pressure, and what is its primary effect?

Accepted Answer

Atrial natriuretic peptide (ANP); lowers blood pressure by increasing sodium excretion

Question 13

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

Accepted Answer

They prevent the AV valves from inverting into the atria during ventricular systole.

Question 14

Which of the following is a correct sequence of blood flow through the heart and major vessels, starting from the systemic veins?

Accepted Answer

Systemic veins → right atrium → right ventricle → pulmonary artery → lungs → left atrium → left ventricle → aorta

Question 15

Which of the following best explains why the epicardium contains a significant amount of adipose tissue?

Accepted Answer

It serves as an energy reserve for the heart's high metabolic activity.

Question 16

Which of the following is a function of the trabeculae carneae in the ventricles?

Accepted Answer

They prevent the walls of the ventricles from sticking together during contraction.

Question 17

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

Accepted Answer

They have three cusps and are located at the base of the aorta and pulmonary artery.

Question 18

Which of the following best explains the concept of 'muscle pumping' in the context of venous blood flow?

Accepted Answer

Contraction of skeletal muscles compresses veins, propelling blood toward the heart.

Question 19

Which of the following equations correctly represents the pressure required to open a semilunar valve?

Accepted Answer

$$P_{ventricle} \u003e P_{aorta}$$

Cardiovascular System: Structure and Function Study Guide

Study Guide - Practice Questions