Question 1

Which of the following best describes the function of elastic (conducting) arteries in the cardiovascular system?

Accepted Answer

They act as pressure reservoirs, expanding and recoiling as blood is ejected from the heart.

Question 2

A patient presents with a blood pressure reading of 150/95 mm Hg. Calculate the mean arterial pressure (MAP) using the formula $$MAP = 	ext{diastolic pressure} + \frac{1}{3}(	ext{systolic pressure} - 	ext{diastolic pressure}). $$Which value is correct?

Accepted Answer

$$MAP = 95 + \frac{1}{3}(150-95) = 95 + \frac{1}{3}(55) = 95 + 18.33 = 113.33 mm Hg$$

Question 3

Which structural feature is unique to veins and helps maintain unidirectional blood flow toward the heart, especially in the limbs?

Accepted Answer

Valves

Question 4

A patient with severe blood loss is experiencing hypovolemic shock. Which of the following best explains the physiological basis for this condition?

Accepted Answer

Blood vessels are inadequately filled, resulting in insufficient circulation to meet tissue needs.

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 allowing passage of large molecules and cells.

Question 6

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

Accepted Answer

Resistance decreases to 1/16 of its original value.

Question 7

Which of the following mechanisms is primarily responsible for the short-term regulation of blood pressure?

Accepted Answer

Neural and hormonal controls that alter peripheral resistance and cardiac output.

Question 8

A patient with chronic hypertension is at increased risk for which of the following complications?

Accepted Answer

Heart failure, vascular disease, renal failure, and stroke

Question 9

Which of the following best describes the effect of norepinephrine and epinephrine released from the adrenal medulla on blood vessels during a 'fight or flight' response?

Accepted Answer

They cause generalized vasoconstriction but may cause vasodilation in vessels with beta-2 receptors.

Question 10

Which of the following equations correctly relates blood flow (F), pressure gradient ($$\Delta P$$), and resistance (R)?

Accepted Answer

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

Question 11

Which of the following is a direct effect of increased capillary hydrostatic pressure ($$HP_c) at $$the arterial end of a capillary bed?

Accepted Answer

It promotes the filtration of fluid out of the capillary into the interstitial space.

Question 12

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

Accepted Answer

The total cross-sectional area of capillaries is greatest, causing velocity to decrease.

Question 13

A patient with Addison’s disease is likely to experience which alteration in blood pressure?

Accepted Answer

Chronic hypotension due to inadequate adrenal cortex function.

Question 14

Which of the following is a function of the precapillary sphincters in capillary beds?

Accepted Answer

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

Question 15

Which of the following best describes the effect of metabolic autoregulation in skeletal muscle during exercise?

Accepted Answer

Local vasodilators override sympathetic vasoconstriction, increasing blood flow to active muscles.

Question 16

Which of the following is the primary determinant of peripheral resistance in the systemic circulation?

Accepted Answer

Arteriolar diameter

Question 17

Which of the following statements about the renin-angiotensin-aldosterone system is correct?

Accepted Answer

Angiotensin II is a potent vasoconstrictor and stimulates aldosterone and ADH release.

Question 18

Which of the following best describes the difference between continuous and fenestrated capillaries?

Accepted Answer

Continuous capillaries have tight junctions with intercellular clefts, while fenestrated capillaries have pores that increase permeability.

Question 19

A patient is found to have a blockage in an arterial anastomosis. What is the most likely outcome?

Accepted Answer

Tissue death is unlikely because collateral channels provide alternate pathways for blood flow.

The Cardiovascular System: Blood Vessels – Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards