Q: Which equation correctly calculates the mean arterial pressure (MAP) given a systolic pressure of 120 mm Hg and a diastolic pressure of 80 mm Hg?

$$\text{MAP} = \text{diastolic pressure} + \frac{1}{3} (\text{systolic pressure} - \text{diastolic pressure})$$

Q: If the hydrostatic pressure at the arteriolar end of a capillary is 35 mm Hg and the colloid osmotic pressure is 22 mm Hg, what is the net filtration pressure (NFP) at this end?

$$\text{NFP} = 35 \text{ mm Hg} - 22 \text{ mm Hg} = 13 \text{ mm Hg}$$

Question 1

Which layer of the blood vessel wall is primarily responsible for controlling the diameter of the vessel and thus regulating blood flow and blood pressure?

Accepted Answer

Tunica media

Question 2

A patient presents with severe edema in the abdomen (ascites). Which of the following is the most likely cause based on capillary dynamics?

Accepted Answer

Decreased colloid osmotic pressure due to liver disease

Question 3

Which equation correctly calculates the mean arterial pressure (MAP) given a systolic pressure of 120 mm Hg and a diastolic pressure of 80 mm Hg?

Accepted Answer

$$	ext{MAP} = 	ext{diastolic pressure} + \frac{1}{3} (	ext{systolic pressure} - 	ext{diastolic pressure})$$

Question 4

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

Accepted Answer

They prevent backward flow of blood in veins, especially in the legs.

Question 5

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

Accepted Answer

Metabolic controls causing vasodilation of arterioles

Question 6

Which of the following statements about capillary exchange is correct?

Accepted Answer

Lipid-soluble substances cross capillary walls by diffusion through endothelial cell membranes.

Question 7

A patient is diagnosed with hypotension and shows symptoms of organ failure. Which of the following is the most likely underlying cause?

Accepted Answer

Reduced blood volume (hypovolemia)

Question 8

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

Accepted Answer

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

Question 9

Which type of capillary is most likely to be found in the liver and allows passage of large proteins and blood cells?

Accepted Answer

Sinusoidal capillary

Question 10

If the hydrostatic pressure at the arteriolar end of a capillary is 35 mm Hg and the colloid osmotic pressure is 22 mm Hg, what is the net filtration pressure (NFP) at this end?

Accepted Answer

$$	ext{NFP} = 35 	ext{ mm Hg} - 22 	ext{ mm Hg} = 13 	ext{ mm Hg}$$

Question 11

Which hormone is released in response to decreased blood pressure and acts to increase water retention by the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 12

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

Accepted Answer

Total cross-sectional area of capillaries is greatest.

Question 13

Which of the following is a direct effect of sympathetic nervous system stimulation on blood vessels?

Accepted Answer

Vasoconstriction of arterioles

Question 14

Which of the following is NOT a function of arteries?

Accepted Answer

Exchange of gases and nutrients

Question 15

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

Accepted Answer

Increased blood viscosity

Question 16

A patient is experiencing severe allergic reaction and develops anaphylactic shock. What is the primary physiological cause of this condition?

Accepted Answer

Excessive vasodilation due to histamine release

Question 17

Which of the following best describes the effect of the myogenic mechanism in local autoregulation?

Accepted Answer

It slows blood flow by increasing resistance when arteriolar pressure rises.

Question 18

Which of the following is the most compliant vessel type, allowing it to accommodate added fluid with only a small rise in pressure?

Accepted Answer

Veins

Question 19

Which of the following is a real-life application of the baroreceptor reflex?

Accepted Answer

Carotid sinus massage to reduce dangerously high blood pressure

Question 20

Which of the following best describes the effect of atrial natriuretic peptide (ANP) on blood pressure?

Accepted Answer

ANP decreases blood pressure by causing kidneys to excrete more water and sodium.

Chapter 18: The Cardiovascular System II – Blood Vessels and Hemodynamics

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