Question 1

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

Accepted Answer

Myocardium

Question 2

During the cardiac cycle, which event corresponds to ventricular contraction and the ejection of blood?

Accepted Answer

Systole

Question 3

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

Accepted Answer

They supply oxygenated blood to the myocardium.

Question 4

A patient’s ECG shows an absent P wave. Which part of the heart’s conduction system is most likely malfunctioning?

Accepted Answer

Sinoatrial (SA) node

Question 5

Which heart sound is associated with the closure of the atrioventricular valves?

Accepted Answer

S1 (lub)

Question 6

According to Starling’s Law of the heart, which statement is correct?

Accepted Answer

The greater the stretch of cardiac muscle fibers, the stronger the contraction.

Question 7

Which equation correctly represents cardiac output ($$CO$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 8

Which of the following best describes the effect of sympathetic stimulation on the heart?

Accepted Answer

Increases heart rate and force of contraction

Question 9

The medulla oblongata regulates heart rate primarily by:

Accepted Answer

Sending signals via the autonomic nervous system

Question 10

Which of the following is a major difference between arteries and veins?

Accepted Answer

Arteries have thicker walls and higher pressure than veins.

Question 11

Which vessel is NOT part of the pulmonary circulation?

Accepted Answer

Aorta

Question 12

In portal circulation, blood flows from one capillary bed to another before returning to the heart. Which organ is central to this process?

Accepted Answer

Liver

Question 13

Which factor most directly resists the flow of blood through vessels?

Accepted Answer

Vessel diameter

Question 14

Which mechanism assists the return of venous blood to the heart?

Accepted Answer

Skeletal muscle contraction

Question 15

Which equation best represents blood pressure ($$BP$$)?

Accepted Answer

$$BP = CO 	imes TPR$$

Question 16

A newborn’s circulation differs from an adult’s primarily because:

Accepted Answer

The newborn’s blood bypasses the lungs via the ductus arteriosus and foramen ovale.

Question 17

Which hormone increases blood pressure by causing vasoconstriction?

Accepted Answer

Antidiuretic hormone (ADH)

Question 18

Where is the pulse most commonly felt in a clinical setting?

Accepted Answer

Radial artery

Question 19

Which of the following best explains why capillaries are the site of material exchange?

Accepted Answer

They have a large surface area and thin walls.

Question 20

A patient with a blocked right coronary artery is most likely to experience problems in which region of the heart?

Accepted Answer

Right ventricle

ANP Study Guide: Heart and Blood Vessels

Study Guide - Practice Questions