Question 1

Which of the following best describes the primary function of the tunica media in blood vessels?

Accepted Answer

It regulates the diameter of the vessel through contraction and relaxation of smooth muscle.

Question 2

A patient is diagnosed with a condition that weakens the elastic fibers in their aorta. Which of the following physiological consequences is most likely to occur?

Accepted Answer

Reduced ability to maintain blood pressure between heartbeats.

Question 3

Which type of capillary would you expect to find in the liver, and why?

Accepted Answer

Sinusoidal capillaries, because their large gaps allow passage of proteins and cells.

Question 4

During vigorous exercise, arterioles supplying skeletal muscle dilate. What is the effect on blood flow and resistance in these vessels?

Accepted Answer

Blood flow increases and resistance decreases.

Question 5

Which of the following equations correctly represents the relationship between blood flow (F), pressure difference ($$\Delta P$$), and resistance (R) in a vessel?

Accepted Answer

$$F = \Delta P / R$$

Question 6

Which structural feature is unique to medium-sized veins and is critical for returning blood to the heart, especially from the lower limbs?

Accepted Answer

Venous valves

Question 7

A blood vessel is observed to have a thick tunica media, a relatively small lumen, and extra elastic membranes. Which type of vessel is this most likely to be?

Accepted Answer

Elastic artery

Question 8

Which of the following best explains why veins can serve as blood reservoirs?

Accepted Answer

They have larger lumens and can expand to hold more blood.

Question 9

Which of the following is the correct sequence of blood flow through the hepatic portal system?

Accepted Answer

Heart → Arteries → Capillary bed in digestive tract → Hepatic portal vein → Capillary bed in liver → Veins → Heart

Question 10

A newborn fails to close the foramen ovale after birth. What is the most likely consequence?

Accepted Answer

Oxygenated blood bypasses the lungs and mixes with deoxygenated blood.

Question 11

Which of the following arteries is a direct branch of the aortic arch?

Accepted Answer

Left subclavian artery

Question 12

Which vessel type is most responsible for regulating systemic blood pressure and why?

Accepted Answer

Arterioles, because they can constrict or dilate to change resistance.

Question 13

Which of the following best describes the function of precapillary sphincters?

Accepted Answer

They regulate blood flow into capillary beds based on tissue needs.

Question 14

Which of the following statements about the distribution of blood in the cardiovascular system is correct?

Accepted Answer

Veins contain about two-thirds of the body's blood volume.

Question 15

A patient has a blockage in the left common carotid artery. Which region is most at risk for reduced blood supply?

Accepted Answer

Left side of the head and neck

Question 16

Which of the following is a key difference between continuous and fenestrated capillaries?

Accepted Answer

Fenestrated capillaries have pores that allow for faster exchange of small molecules.

Question 17

Which of the following best explains why superficial veins are commonly used for intravenous (IV) access?

Accepted Answer

They are closer to the surface and easier to access.

Question 18

Which fetal structure allows blood to bypass the nonfunctional fetal lungs by connecting the pulmonary trunk to the aortic arch?

Accepted Answer

Ductus arteriosus

Question 19

Which of the following best describes the role of the hepatic portal vein?

Accepted Answer

It delivers nutrient-rich blood from the digestive tract to the liver.

Question 20

Which of the following is a correct statement about the closure of fetal shunts at birth?

Accepted Answer

The foramen ovale closes due to increased pressure in the left atrium.

Study Guide: The Cardiovascular System – Blood Vessels and Circulation

Study Guide - Practice Questions

Study Guide - Flashcards