Question 1

Which of the following best describes the function of elastic arteries in the circulatory system?

Accepted Answer

They act as pressure reservoirs, expanding and recoiling to maintain continuous blood flow during the cardiac cycle.

Question 2

A patient presents with a ruptured aneurysm in the aorta. Which property of the aorta is most directly related to the development of an aneurysm?

Accepted Answer

High elastin content in the arterial wall

Question 3

Which of the following equations correctly relates blood flow (F), pressure gradient (ΔP), and resistance (R)?

Accepted Answer

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

Question 4

If the radius of a blood vessel is reduced by half, how does the resistance to blood flow change?

Accepted Answer

Resistance increases by 16 times

Question 5

Which type of capillary is most likely to be found in the liver and bone marrow, and why?

Accepted Answer

Sinusoidal capillaries, because they have large intercellular clefts and fenestrations for passage of large molecules and cells

Question 6

A patient with chronic hypertension has baroreceptors that are less sensitive to high blood pressure. What is the physiological consequence of this adaptation?

Accepted Answer

Baroreceptors will fail to lower blood pressure effectively, allowing hypertension to persist.

Question 7

Which of the following best explains why veins are called capacitance vessels?

Accepted Answer

They can accommodate large volumes of blood at low pressure.

Question 8

A person stands up quickly from a lying position and feels dizzy. Which reflex is primarily responsible for restoring blood pressure to the brain?

Accepted Answer

Baroreceptor reflex

Question 9

Which of the following hormones would most likely cause a decrease in mean arterial pressure (MAP)?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 10

A patient has a blood pressure of 120/80 mm Hg. What is their mean arterial pressure (MAP)?

Accepted Answer

$$MAP = 80 + \frac{1}{3}(120-80) = 93.3 mm Hg$$

Question 11

Which of the following mechanisms is NOT a short-term regulator of blood pressure?

Accepted Answer

Renal regulation of blood volume

Question 12

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

Accepted Answer

Intrinsic metabolic autoregulation causing vasodilation of arterioles in active muscles

Question 13

Which of the following best describes the effect of nitric oxide (NO) on blood vessels?

Accepted Answer

It causes vasodilation by relaxing vascular smooth muscle.

Question 14

A patient with polycythemia (increased RBC count) is likely to have which of the following changes in their circulatory system?

Accepted Answer

Increased blood viscosity and increased total peripheral resistance (TPR)

Question 15

Which of the following is a correct sequence of blood flow through the systemic circulation?

Accepted Answer

Artery → Capillary → Vein

Question 16

Which of the following best explains why capillary blood pressure is low compared to arterial blood pressure?

Accepted Answer

High pressure would rupture the thin walls of capillaries.

Question 17

Which of the following adaptations does NOT assist venous return to the heart?

Accepted Answer

Thick tunica media in veins

Question 18

Which of the following statements about arterioles is correct?

Accepted Answer

They are called resistance vessels because they regulate blood flow into capillary beds.

Question 19

A patient is given a drug that blocks angiotensin-converting enzyme (ACE). What is the expected effect on blood pressure?

Accepted Answer

Blood pressure will decrease due to reduced formation of angiotensin II.

Question 20

Which of the following best describes the role of precapillary sphincters in capillary beds?

Accepted Answer

They regulate blood flow into true capillaries based on local chemical conditions.

Blood Vessels and Circulation: Structure, Function, and Regulation

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