Question 1

Which of the following correctly lists the three structural layers (tunics) found in most blood vessels, from innermost to outermost?

Accepted Answer

Tunica intima, tunica media, tunica externa

Question 2

The tunica intima is primarily composed of which type of tissue?

Accepted Answer

Simple squamous epithelium (endothelium)

Question 3

Which layer of a blood vessel is responsible for vasoconstriction and vasodilation?

Accepted Answer

Tunica media

Question 4

A patient is diagnosed with a disorder affecting the vasa vasorum. Which blood vessel layer is most likely impacted?

Accepted Answer

Tunica externa

Question 5

Which of the following statements about the tunica media is TRUE?

Accepted Answer

It contains smooth muscle and elastic fibers.

Question 6

If a blood vessel loses its ability to contract and relax, which layer is most likely dysfunctional?

Accepted Answer

Tunica media

Question 7

Which blood vessel layer contains the greatest proportion of collagen fibers?

Accepted Answer

Tunica externa

Question 8

The internal elastic lamina (IEL) is found between which two layers of a blood vessel?

Accepted Answer

Tunica intima and tunica media

Question 9

Which layer of the blood vessel is in direct contact with the blood?

Accepted Answer

Tunica intima

Question 10

A drug that targets the smooth muscle in blood vessels would primarily affect which tunic?

Accepted Answer

Tunica media

Question 11

Which of the following is a function of the vasa vasorum?

Accepted Answer

Supplying nutrients to the outer layers of large blood vessels

Question 12

If the endothelium of a blood vessel is damaged, which tunic is directly affected?

Accepted Answer

Tunica intima

Question 13

Which of the following equations best represents the relationship between vessel radius and blood flow, according to Poiseuille’s Law?

Accepted Answer

$$Q = \frac{\pi \Delta P r^4$}{8 \eta l}$$

Question 14

Which tunic is most responsible for the ability of arteries to withstand and dampen the pressure fluctuations caused by the heartbeat?

Accepted Answer

Tunica media

Question 15

A histological slide shows a blood vessel with a thick layer of smooth muscle and prominent elastic fibers. Which type of vessel is this most likely to be?

Accepted Answer

Large artery

Question 16

Which of the following statements is TRUE regarding the tunica media in veins compared to arteries?

Accepted Answer

The tunica media in arteries is thicker than in veins.

Question 17

Which component of the tunica intima provides a smooth surface to minimize friction as blood flows through the lumen?

Accepted Answer

Endothelium

Question 18

A patient with a genetic defect in collagen synthesis would most likely have structural problems in which blood vessel layer?

Accepted Answer

Tunica externa

Question 19

Which layer of the blood vessel is LEAST involved in the regulation of blood pressure?

Accepted Answer

Tunica externa

Question 20

Which of the following best describes the function of the external elastic lamina (EEL) in large arteries?

Accepted Answer

It provides elasticity to the vessel wall, allowing it to stretch and recoil.

Blood Vessel Structure: Layers and Functions

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