Question 1

Which of the following features is unique to cardiac muscle cells compared to skeletal muscle cells?

Accepted Answer

They possess intercalated discs that allow rapid electrical conduction between cells.

Question 2

A patient’s blood flows from the right atrium to the right ventricle, then to the lungs. What is the correct sequence for the rest of the blood’s path through the heart and circulatory system?

Accepted Answer

Left atrium → left ventricle → aorta → systemic circulation → vena cava → right atrium

Question 3

On an EKG, what does the QRS complex represent?

Accepted Answer

Ventricular depolarization

Question 4

Which phase of the cardiac cycle is characterized by ventricular relaxation and filling?

Accepted Answer

Diastole

Question 5

Which of the following would most likely increase stroke volume?

Accepted Answer

Increased contractility of the heart muscle

Question 6

Which factor would NOT directly increase heart rate?

Accepted Answer

Increased parasympathetic stimulation

Question 7

A patient presents with a heart rate of 120 beats per minute. This condition is best described as:

Accepted Answer

Tachycardia

Question 8

Which of the following is a common effect of aging on the heart?

Accepted Answer

Decreased cardiac output

Question 9

Which type of artery is most responsible for regulating blood pressure and flow to specific tissues?

Accepted Answer

Muscular arteries

Question 10

Which type of capillary is found in the liver and allows the passage of large molecules?

Accepted Answer

Sinusoidal capillaries

Question 11

Blood pressure is measured as two numbers, such as 120/80 mmHg. What do these numbers represent?

Accepted Answer

Systolic pressure / Diastolic pressure

Question 12

Which of the following would most likely decrease blood flow resistance?

Accepted Answer

Increasing vessel diameter

Question 13

Given the equation $BP = CO 	imes SV 	imes PR$, which variable would be most directly affected by a sudden increase in heart rate?

Accepted Answer

Cardiac output ($CO$)

Question 14

Which mechanism helps venous blood return to the heart against gravity?

Accepted Answer

Skeletal muscle contractions compressing veins

Question 15

Baroreceptors primarily respond to changes in:

Accepted Answer

Blood pressure

Question 16

Chemoreceptors in the carotid bodies are most sensitive to changes in:

Accepted Answer

Blood oxygen, carbon dioxide, and pH levels

Question 17

Which hormone is most important for short-term regulation of blood pressure during stress?

Accepted Answer

Epinephrine

Question 18

Which organ is primarily responsible for long-term regulation of blood pressure?

Accepted Answer

Kidneys

Question 19

Which type of circulatory shock is caused by severe blood loss?

Accepted Answer

Hypovolemic shock

Question 20

Which pressure is responsible for pushing fluid out of capillaries into the surrounding tissue?

Accepted Answer

Capillary hydrostatic pressure

Cardiovascular System: Structure, Function, and Regulation

Study Guide - Practice Questions

Study Guide - Flashcards