Question 1

Which of the following best describes the location of the heart within the thoracic cavity?

Accepted Answer

It is located in the mediastinum, slightly to the left, within the pericardial cavity.

Question 2

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

Accepted Answer

Left atrium

Question 3

A patient presents with chest pain radiating to the left arm, shortness of breath, and sweating. Which condition is most likely responsible for these symptoms?

Accepted Answer

Myocardial infarction

Question 4

Which of the following statements about the fibrous skeleton of the heart is correct?

Accepted Answer

It acts as an insulator for the heart's electrical activity and provides structural support.

Question 5

During the cardiac cycle, which event occurs when the pressure in the left ventricle exceeds that in the aorta?

Accepted Answer

The aortic valve opens and blood is ejected into the aorta.

Question 6

Which formula correctly calculates cardiac output?

Accepted Answer

$$CO = HR 	imes SV$$

Question 7

A patient with long-standing hypertension is found to have left ventricular hypertrophy. Which of the following best explains this adaptation?

Accepted Answer

Increased afterload requires the ventricle to generate more tension, resulting in hypertrophy.

Question 8

Which of the following is a function of atrial natriuretic peptide (ANP) produced by the heart?

Accepted Answer

It decreases sodium retention in the kidneys, lowering blood pressure.

Question 9

Which of the following correctly describes the flow of blood through the heart and major vessels?

Accepted Answer

Oxygenated blood is pumped from the left ventricle into the aorta.

Question 10

Which of the following is true regarding the plateau phase of the cardiac contractile cell action potential?

Accepted Answer

It is sustained by the slow influx of calcium ions and efflux of potassium ions.

Question 11

A patient is diagnosed with cardiac tamponade. What is the primary physiological consequence of this condition?

Accepted Answer

Reduced ventricular filling and compromised cardiac output due to pressure from excess pericardial fluid.

Question 12

Which of the following best describes the Frank-Starling law of the heart?

Accepted Answer

The greater the stretch of ventricular muscle cells, the more forcefully they contract.

Question 13

Which of the following is a correct calculation for stroke volume?

Accepted Answer

$$SV = EDV - ESV$$

Question 14

Which of the following is a distinguishing feature of cardiac muscle cells compared to skeletal muscle cells?

Accepted Answer

Cardiac muscle cells are short, branched, have a single nucleus, and are connected by intercalated discs.

Question 15

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

Accepted Answer

The SA node sets the normal pace of the heart, known as sinus rhythm.

Question 16

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

Accepted Answer

It pumps blood against higher resistance into the systemic circuit.

Question 17

Which of the following is a consequence of a stenotic heart valve?

Accepted Answer

Calcium deposits make the valve hard and inflexible, making it harder for the heart to eject blood.

Question 18

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

Accepted Answer

They allow ions to pass between cells, enabling the heart to contract as a functional syncytium.

Question 19

Which of the following is a positive chronotropic agent?

Accepted Answer

Sympathetic nervous stimulation

Question 20

A patient with heart failure is experiencing pulmonary edema. Which ventricle is most likely failing?

Accepted Answer

Left ventricle

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

Study Guide - Practice Questions

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