Question 1

Which of the following best describes the structural difference between elastic arteries and muscular arteries?

Accepted Answer

Elastic arteries have a high proportion of elastic fibers in the tunica media, allowing them to stretch and recoil, while muscular arteries have more smooth muscle for vasoconstriction and vasodilation.

Question 2

A patient presents with swelling in the lower limbs and visible, twisted veins. Which vascular disease is most likely responsible for these symptoms?

Accepted Answer

Varicose veins

Question 3

Which of the following equations correctly represents the relationship between blood flow ($$F$$), blood pressure ($$\Delta P$$), and vascular resistance ($$R$$)?

Accepted Answer

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

Question 4

Which factor has the greatest effect on vascular resistance according to Poiseuille’s law?

Accepted Answer

Blood vessel diameter

Question 5

Given the following values: capillary hydrostatic pressure ($$HP_c = 35$$ mmHg), interstitial fluid hydrostatic pressure ($$HP_{if} = 0$$ mmHg), capillary colloid osmotic pressure ($$OP_c = 26$$ mmHg), and interstitial fluid colloid osmotic pressure ($$OP_{if} = 1$$ mmHg), what is the net filtration pressure ($$NFP) at $$the arterial end of a capillary?

Accepted Answer

$$NFP = (HP_c + OP_{if}) - (HP_{if} + OP_c) = (35 + 1) - (0 + 26) = 10$$ mmHg

Question 6

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

Accepted Answer

Capillaries have the highest total cross-sectional area, causing blood flow velocity to decrease.

Question 7

A patient is diagnosed with primary hypertension. Which of the following is TRUE regarding this condition?

Accepted Answer

It is also known as essential hypertension and has no identifiable cause.

Question 8

Which short-term mechanism is primarily responsible for rapid adjustments in mean arterial pressure during exercise?

Accepted Answer

Neural control via baroreceptor reflexes

Question 9

Which of the following best describes the process of autoregulation in blood flow?

Accepted Answer

Autoregulation is the ability of tissues to regulate their own blood flow in response to changing metabolic needs, achieved by local metabolic and myogenic mechanisms.

Question 10

Which of the following would most likely result in edema?

Accepted Answer

Increased capillary hydrostatic pressure

Question 11

A patient with severe blood loss is at risk for which type of circulatory shock?

Accepted Answer

Hypovolemic shock

Question 12

Which of the following statements about veins is correct?

Accepted Answer

Veins contain valves to prevent backflow and have thinner walls than arteries.

Question 13

Which of the following is a characteristic of an aneurysm?

Accepted Answer

A localized dilation of a blood vessel wall, which can rupture and cause hemorrhage.

Question 14

Which of the following best describes the effect of increased blood viscosity on vascular resistance?

Accepted Answer

Increased blood viscosity increases vascular resistance.

Question 15

If a patient’s systolic pressure is 120 mmHg and diastolic pressure is 80 mmHg, what is the mean arterial pressure ($$MAP$$)?

Accepted Answer

$$MAP = 80 + \frac{(120 - 80)}{3} = 80 + \frac{40}{3} \approx 93$$ mmHg

Question 16

Which of the following is TRUE regarding capillary pressure compared to mean arterial pressure and venous pressure?

Accepted Answer

Capillary pressure is lower than mean arterial pressure but higher than venous pressure.

Question 17

Which of the following is a long-term mechanism for regulating mean arterial pressure?

Accepted Answer

Renal control of blood volume

Question 18

Which of the following best describes the distribution of blood during vigorous exercise?

Accepted Answer

Blood flow to skeletal muscles increases, while flow to digestive organs decreases.

Question 19

Which of the following is the primary force driving fluid out of capillaries at the arterial end?

Accepted Answer

Capillary hydrostatic pressure

Question 20

A patient experiences sudden, widespread vasodilation due to an allergic reaction. Which type of shock is most likely occurring?

Accepted Answer

Anaphylactic shock

Circulation: Structure, Function, and Regulation of Blood Vessels

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