Q: Which of the following is a correct formula for calculating mean arterial pressure (MAP)?

$$MAP = Diastolic\ Pressure + \dfrac{1}{3} \times Pulse\ Pressure$$

Question 1

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

Accepted Answer

Tunica media

Question 2

A patient is experiencing chronic hypertension. Which of the following mechanisms is LEAST likely to provide long-term regulation of their blood pressure?

Accepted Answer

Baroreceptor reflexes

Question 3

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

Accepted Answer

Continuous capillaries

Question 4

If the radius of a blood vessel doubles, by what factor does the resistance to blood flow change, according to Poiseuille’s law?

Accepted Answer

$$1/16$$

Question 5

Which of the following is a correct formula for calculating mean arterial pressure (MAP)?

Accepted Answer

$$MAP = Diastolic\ Pressure + \dfrac{1}{3} 	imes Pulse\ Pressure$$

Question 6

A patient has a blood pressure of 130/85 mm Hg. What is their pulse pressure and mean arterial pressure (MAP)?

Accepted Answer

Pulse pressure: 45 mm Hg; MAP: 100 mm Hg

Question 7

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

Accepted Answer

High arterial pressure

Question 8

Which hormone decreases blood pressure by antagonizing aldosterone and promoting sodium excretion?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 9

A patient loses a large amount of blood due to trauma. Which type of shock are they most likely to experience?

Accepted Answer

Hypovolemic shock

Question 10

Which of the following statements about arteries and veins is TRUE?

Accepted Answer

Veins act as blood reservoirs and contain about 65% of the blood supply

Question 11

Which of the following would most likely cause an increase in peripheral resistance?

Accepted Answer

Decreased vessel diameter

Question 12

Which of the following is the correct relationship between blood flow ($$F$$), pressure gradient ($$\Delta P$$), and resistance ($$R$$)?

Accepted Answer

$$F = \Delta P / R$$

Question 13

Which of the following is a function of the vasa vasorum?

Accepted Answer

Nourishes the outermost layer of large blood vessels

Question 14

A patient stands up quickly and experiences dizziness due to a temporary drop in blood pressure. Which term best describes this condition?

Accepted Answer

Orthostatic hypotension

Question 15

Which of the following is NOT a direct effect of angiotensin II?

Accepted Answer

Decreases antidiuretic hormone (ADH) release

Question 16

Which of the following best describes the role of baroreceptors in blood pressure regulation?

Accepted Answer

They sense changes in blood pressure and initiate reflexes to maintain homeostasis

Question 17

Which of the following would most likely result in turbulent blood flow and increased resistance?

Accepted Answer

Fatty plaques from atherosclerosis

Question 18

Which of the following is TRUE regarding capillary beds in the intestinal mesenteries?

Accepted Answer

They contain vascular shunts that bypass true capillaries

Question 19

Which of the following is a correct equation relating mean arterial pressure (MAP), cardiac output (CO), and peripheral resistance (R)?

Accepted Answer

$$MAP = CO 	imes R$$

Question 20

Which of the following is a major risk factor for primary hypertension?

Accepted Answer

Obesity

Ch.19 pt.1 Blood Vessel Structure and Function: The Cardiovascular System

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