$$Cardiac\ Output = Heart\ Rate \times Stroke\ Volume$$

Question 1

Which of the following best explains why arteries have thicker muscular and elastic walls compared to veins?

Accepted Answer

Arteries need to withstand the high pressure of blood pumped directly from the heart.

Question 2

During the 'fight or flight' response, which hormone is released to increase heart rate and blood pressure?

Accepted Answer

Adrenaline

Question 3

What is the primary function of the semi-lunar valves found in veins?

Accepted Answer

To prevent the backflow of blood

Question 4

Which part of the brain controls changes in heart rate through nerve impulses?

Accepted Answer

Medulla

Question 5

If a person is frightened and their heart rate increases, which nerve is primarily responsible for this change?

Accepted Answer

Accelerator nerve

Question 6

Which of the following statements about capillaries is correct?

Accepted Answer

Capillaries are small enough to fit between cells and allow materials to pass easily through their walls.

Question 7

Red blood cells are destroyed in which organ after their lifespan ends?

Accepted Answer

Spleen

Question 8

Which of the following is NOT a function of the accelerator nerve?

Accepted Answer

Decreasing the force of heart contractions

Question 9

A patient has a condition where blood tends to pool in their lower limbs due to faulty valves. Which vessel type is most likely affected?

Accepted Answer

Veins

Question 10

Which feature of red blood cells allows them to efficiently transport oxygen?

Accepted Answer

Their specialized shape and lack of nucleus

Question 11

If the decelerator nerve is stimulated, what is the expected effect on blood pressure?

Accepted Answer

Blood pressure decreases

Question 12

Which equation best represents the relationship between cardiac output, heart rate, and stroke volume?

Accepted Answer

$$Cardiac\ Output = Heart\ Rate 	imes Stroke\ Volume$$

Question 13

Which of the following best describes the role of capillaries in tissue respiration?

Accepted Answer

They bring blood close to every cell, allowing oxygen to diffuse quickly.

Question 14

A person is experiencing increased heart rate and blood pressure due to stress. Which gland is most likely responsible for this response?

Accepted Answer

Adrenal gland

Question 15

Which of the following is a correct sequence of blood flow through the vessels?

Accepted Answer

Arteries → Capillaries → Veins

Question 16

Which of the following is a plausible consequence if the semi-lunar valves in veins fail to function properly?

Accepted Answer

Blood may flow backward, leading to varicose veins.

Question 17

Which cell type in blood is primarily responsible for oxygen transport?

Accepted Answer

Erythrocytes

Question 18

A patient with a damaged medulla would most likely experience problems with which physiological process?

Accepted Answer

Regulation of heart rate

Question 19

Which vessel type is most likely to have the lowest blood pressure?

Accepted Answer

Veins

Question 20

Which of the following best describes the lifespan and fate of red blood cells?

Accepted Answer

They live about 100 days and are destroyed in the spleen.

Circulatory System: Blood Vessels, Heart Rate Regulation, and Blood Composition

Study Guide - Practice Questions