Q: A patient’s blood pressure is measured as 130/85 mm Hg. What is the mean arterial pressure (MAP)? Use the formula $$MAP = \text{diastolic pressure} + \frac{1}{3} \times \text{pulse pressure}.$$

$$MAP = 85 + \frac{1}{3} \times (130 - 85) = 85 + 15 = 100 mm Hg$$

Question 1

Which layer of the blood vessel wall is primarily responsible for vasoconstriction and vasodilation, and what is its main tissue type?

Accepted Answer

Tunica media; composed mainly of smooth muscle and elastin

Question 2

A patient presents with dilated and painful veins in the lower limbs after prolonged standing. Which adaptation of veins has most likely failed, and what is the condition called?

Accepted Answer

Venous valves; varicose veins

Question 3

Which type of capillary is most abundant in the skin and muscles, and what feature allows limited passage of fluids and small solutes?

Accepted Answer

Continuous capillaries; intercellular clefts

Question 4

Which equation correctly describes the relationship between blood flow ($$F$$), blood pressure gradient ($$\Delta P$$), and resistance ($$R$$)?

Accepted Answer

$$F = \frac{\Delta P}{R}$$

Question 5

A patient’s blood pressure is measured as 130/85 mm Hg. What is the mean arterial pressure (MAP)? Use the formula $$MAP = 	ext{diastolic pressure} + \frac{1}{3} 	imes 	ext{pulse pressure}.$$

Accepted Answer

$$MAP = 85 + \frac{1}{3} 	imes (130 - 85) = 85 + 15 = 100 mm Hg$$

Question 6

Which of the following best explains why arteries are called 'pressure reservoirs'?

Accepted Answer

Their elastic walls expand and recoil to smooth out pressure fluctuations from the heart.

Question 7

Which factor has the greatest influence on peripheral resistance in the vascular system?

Accepted Answer

Blood vessel diameter

Question 8

A blockage in the hepatic portal vein would most directly affect which type of capillary, and what is its main structural feature?

Accepted Answer

Sinusoid capillaries; large lumens and intercellular clefts

Question 9

Which adaptation does NOT aid venous return to the heart?

Accepted Answer

High arterial pressure

Question 10

If a patient has increased blood viscosity due to polycythemia, what effect would this have on peripheral resistance and blood flow?

Accepted Answer

Peripheral resistance increases; blood flow decreases

Question 11

Which of the following is TRUE regarding veins compared to arteries?

Accepted Answer

Veins have larger lumens and lower pressure than arteries.

Question 12

Which of the following best describes the function of capillary beds in tissue microcirculation?

Accepted Answer

They provide direct access for exchange of gases, nutrients, and wastes between blood and interstitial fluid.

Question 13

Which of the following would most likely result from a sudden decrease in arteriole diameter?

Accepted Answer

Increased peripheral resistance and decreased blood flow

Question 14

Which vessel type is most likely to have vasa vasorum, and what is its function?

Accepted Answer

Large arteries; to nourish the outermost layer of the vessel wall

Question 15

A patient with severe liver disease is at risk for bleeding due to fragile capillaries. Which capillary type is most affected and why?

Accepted Answer

Sinusoid capillaries; they have large lumens and allow passage of blood cells

Question 16

Which of the following is a correct statement about arterial blood pressure near the heart?

Accepted Answer

It is pulsatile, rising and falling with each heartbeat.

Question 17

Which of the following best describes the role of arterial anastomoses?

Accepted Answer

They provide alternate pathways for blood to reach a body region.

Question 18

During blood pressure measurement using a sphygmomanometer, what does the first appearance of Korotkoff sounds indicate?

Accepted Answer

Systolic pressure

Question 19

Which of the following is NOT a function of the tunica externa (adventitia) in blood vessels?

Accepted Answer

Providing a slick surface to reduce friction

Question 20

If a patient’s pulse pressure is 50 mm Hg and their diastolic pressure is 90 mm Hg, what is their mean arterial pressure (MAP)? Use $$MAP = 90 + \frac{1}{3} 	imes 50.$$

Accepted Answer

$$MAP = 90 + 16.7 = 106.7 mm Hg$$

Blood Vessels: Structure, Function, and Physiology

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