Question 1

Which layer of a blood vessel is responsible for regulating vasoconstriction and is primarily composed of circular smooth muscle?

Accepted Answer

Tunica media

Question 2

A patient is given a medication that causes arterioles to dilate. What is the expected effect on peripheral resistance and blood pressure?

Accepted Answer

Peripheral resistance decreases and blood pressure falls

Question 3

Which type of blood vessel has the largest total cross-sectional area and the slowest blood flow velocity, allowing for optimal exchange of gases and nutrients?

Accepted Answer

Capillaries

Question 4

If the radius of a blood vessel is doubled, how does the resistance to blood flow change according to the relationship $$R \propto \frac{1}{r^4$}$$?

Accepted Answer

Resistance decreases to 1/16th of the original

Question 5

Which hormone is released by the heart when the myocardium is excessively stretched and acts to lower blood pressure by increasing sodium and water excretion?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 6

A patient with chronic hypertension is prescribed a beta blocker. What is the primary mechanism by which this drug lowers blood pressure?

Accepted Answer

It blocks sympathetic neuron activation at arterioles, reducing vasoconstriction

Question 7

Which of the following equations correctly represents the relationship between mean arterial pressure (MAP), diastolic pressure, and pulse pressure?

Accepted Answer

$$MAP = diastolic\ pressure + 1/3\ pulse\ pressure$$

Question 8

During vigorous exercise, which factor is most responsible for the increase in blood pressure?

Accepted Answer

Increase in stroke volume and heart rate

Question 9

Which of the following is a direct renal mechanism for long-term regulation of blood pressure?

Accepted Answer

Adjustment of water filtration and excretion in response to changes in blood pressure

Question 10

A patient has a blood pressure reading of 150/95 mm Hg. Which term best describes this condition?

Accepted Answer

Primary hypertension

Question 11

Which vessel type contains valves to prevent backflow and serves as a blood reservoir, holding about 60% of the blood volume?

Accepted Answer

Veins

Question 12

Which of the following factors does NOT directly increase blood pressure?

Accepted Answer

Decreased blood volume

Question 13

What is the primary function of precapillary sphincters in capillary beds?

Accepted Answer

To regulate blood flow into true capillaries

Question 14

Which of the following is the most important factor affecting total peripheral resistance under normal physiological conditions?

Accepted Answer

Blood vessel diameter

Question 15

A patient with atherosclerosis develops plaques in their arteries. What is the most likely effect on blood pressure?

Accepted Answer

Blood pressure increases due to turbulent flow and increased resistance

Question 16

Which of the following best describes the movement of fluids at the arterial end of a capillary?

Accepted Answer

Hydrostatic pressure dominates and fluid leaves the capillary

Question 17

Which reflex involves baroreceptors in the carotid sinus and aortic arch, and results in a decrease in heart rate when blood pressure rises?

Accepted Answer

Carotid sinus reflex (Marey's Law)

Question 18

If blood pressure falls, which of the following mechanisms is most likely to be activated to restore homeostasis?

Accepted Answer

Release of renin leading to angiotensin II formation

Question 19

Which of the following is a consequence of ruptured venous valves?

Accepted Answer

Varicose veins

Question 20

Which organ receives the largest percentage of blood flow in the body under resting conditions?

Accepted Answer

Kidneys

Chapter 19: The Cardiovascular System – Blood Vessels

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