Question 1

Which layer of the blood vessel wall is primarily responsible for controlling vasoconstriction and vasodilation, and thus plays a key role in regulating blood pressure?

Accepted Answer

Tunica media

Question 2

A patient presents with abnormally high blood pressure. Which of the following changes in a small arteriole would most effectively decrease peripheral resistance and lower blood pressure, according to the formula $$R = \frac{L n}{r^4$}$$?

Accepted Answer

Increase the vessel radius

Question 3

Which type of capillary is most abundant in the skin and muscles, and forms the blood-brain barrier in the CNS due to tight junctions?

Accepted Answer

Continuous capillaries

Question 4

During vigorous exercise, blood flow to skeletal muscles increases dramatically. Which mechanism is primarily responsible for this local increase in blood flow?

Accepted Answer

Intrinsic metabolic control causing vasodilation

Question 5

Which of the following best describes the function of venous valves?

Accepted Answer

They prevent backflow of blood in veins, especially in the limbs

Question 6

A patient with liver disease develops hypoproteinemia. Which pressure is most directly affected, and what is the likely consequence in terms of fluid movement across capillary walls?

Accepted Answer

Capillary colloid osmotic pressure (OPc) decreases, leading to edema

Question 7

Which equation correctly relates blood flow (F), pressure gradient ($$\Delta P$$), and resistance (R) in the circulatory system?

Accepted Answer

$$F = \Delta P / R$$

Question 8

Which of the following is a major function of the tunica externa (adventitia) in large blood vessels?

Accepted Answer

Anchors the vessel to surrounding tissues and contains vasa vasorum

Question 9

If a patient’s mean arterial pressure (MAP) is calculated using a blood pressure of 130/85 mm Hg, what is the MAP? Use the formula $$MAP = Diastolic + \frac{1}{3} (Systolic - Diastolic).$$

Accepted Answer

MAP = 85 + \frac{1}{3}(45) = 100 mm Hg

Question 10

Which of the following would most likely result in the formation of varicose veins?

Accepted Answer

Incompetent venous valves leading to blood pooling in the lower limbs

Question 11

Which of the following is NOT a typical location for sinusoidal capillaries?

Accepted Answer

Skeletal muscle

Question 12

A blockage in a major artery of the leg is less likely to cause tissue death if which anatomical feature is present?

Accepted Answer

Arterial anastomoses providing collateral circulation

Question 13

Which hormone acts to decrease blood pressure by antagonizing aldosterone and increasing sodium excretion?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 14

Which of the following mechanisms is most important for the return of blood to the heart in the venous system?

Accepted Answer

Muscular pump and venous valves

Question 15

Which of the following would most likely increase net filtration pressure (NFP) and promote edema formation?

Accepted Answer

Increased interstitial fluid colloid osmotic pressure

Question 16

Which of the following is the correct formula for calculating net filtration pressure (NFP) across a capillary wall?

Accepted Answer

$$NFP = (HP_c + OP_{if}) - (HP_{if} + OP_c)$$

Question 17

Which of the following would most likely occur if the baroreceptors in the carotid sinuses and aortic arch are chronically exposed to high blood pressure?

Accepted Answer

Baroreceptors would adapt and become less responsive, allowing hypertension to persist

Question 18

Which of the following is a direct effect of angiotensin II in the regulation of blood pressure?

Accepted Answer

Stimulation of aldosterone secretion

Question 19

Which of the following best explains why blood flow velocity is slowest in the capillaries?

Accepted Answer

Capillaries have the largest total cross-sectional area

Question 20

A patient stands up quickly and experiences a sudden drop in blood pressure. Which reflex is triggered to restore cerebral blood flow?

Accepted Answer

Carotid sinus baroreceptor reflex

Blood Vessel Structure and Function: The Cardiovascular System

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