Q: Calculate the mean arterial pressure (MAP) for a patient with a blood pressure of 130/85 mm Hg. Use the formula $$\text{MAP} = \text{diastolic pressure} + \frac{\text{pulse pressure}}{3}.$$

$$\text{MAP} = 85 + \frac{45}{3} = 100\ \text{mm Hg}$$

Q: If capillary hydrostatic pressure (CHP) is 25 mm Hg and blood colloid osmotic pressure (BCOP) is 18 mm Hg at the venous end, what is the net filtration pressure (NFP)? Use the formula $$\text{NFP} = \text{CHP} - \text{BCOP}.$$

$$\text{NFP} = 18 - 25 = -7\ \text{mm Hg}$$

Question 1

Which layer of the blood vessel wall is primarily responsible for vasoconstriction and vasodilation, and what is its main cellular component?

Accepted Answer

Tunica media; smooth muscle cells

Question 2

A patient presents with a bulge in an arterial wall that risks rupture and internal bleeding. What is this condition called, and which vessel layer is most likely compromised?

Accepted Answer

Aneurysm; tunica media

Question 3

Which type of capillary is most likely found in the liver and allows the passage of large plasma proteins?

Accepted Answer

Sinusoid (sinusoidal capillary)

Question 4

What is the primary mechanism by which water and small solutes are forced out of capillaries at the arterial end?

Accepted Answer

Filtration driven by capillary hydrostatic pressure (CHP)

Question 5

Calculate the mean arterial pressure (MAP) for a patient with a blood pressure of 130/85 mm Hg. Use the formula $$	ext{MAP} = 	ext{diastolic pressure} + \frac{	ext{pulse pressure}}{3}.$$

Accepted Answer

$$	ext{MAP} = 85 + \frac{45}{3} = 100\ 	ext{mm Hg}$$

Question 6

Which of the following best describes the function of venous valves in the lower limbs?

Accepted Answer

They prevent blood from flowing backward and aid venous return during muscle contraction.

Question 7

If a patient has abnormally high blood pressure (hypertension), which hormone is most likely to be released to decrease blood volume and promote vasodilation?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 8

Which vessel type is most distensible and acts as a blood reservoir, accommodating large changes in blood volume?

Accepted Answer

Veins

Question 9

A patient with a plaque deposit in an artery is at risk for increased turbulence and resistance. Which condition does this describe?

Accepted Answer

Atherosclerosis

Question 10

Which capillary type is most likely to be found in the kidneys and endocrine organs, and what feature allows for increased exchange of larger solutes?

Accepted Answer

Fenestrated capillaries; pores in the endothelial lining

Question 11

Which of the following factors will increase total peripheral resistance (TPR) in the cardiovascular system?

Accepted Answer

Increasing vessel length

Question 12

What is the primary route for diffusion of lipid-soluble substances such as oxygen and carbon dioxide across capillary walls?

Accepted Answer

Directly through the endothelial plasma membranes

Question 13

Which reflex is triggered by stretch receptors in the carotid sinuses and aortic arch to regulate blood pressure?

Accepted Answer

Baroreceptor reflex

Question 14

If capillary hydrostatic pressure (CHP) is 25 mm Hg and blood colloid osmotic pressure (BCOP) is 18 mm Hg at the venous end, what is the net filtration pressure (NFP)? Use the formula $$	ext{NFP} = 	ext{CHP} - 	ext{BCOP}.$$

Accepted Answer

$$	ext{NFP} = 18 - 25 = -7\ 	ext{mm Hg}$$

Question 15

Which of the following best explains why capillaries filter more fluid than they reabsorb?

Accepted Answer

The transition point between filtration and reabsorption is closer to the venous end.

Question 16

Which of the following is NOT a function of vasoconstriction in arteries?

Accepted Answer

Increasing capillary blood flow

Question 17

During exercise, which mechanism assists venous return to the heart?

Accepted Answer

Skeletal muscle compression of veins

Question 18

Which hormone is released in response to low blood volume and high plasma osmotic concentration, and what effect does it have?

Accepted Answer

Antidiuretic hormone (ADH); reduces water loss at kidneys and causes vasoconstriction

Question 19

Which capillary type is most likely to be found in the central nervous system and thymus, and what is its permeability characteristic?

Accepted Answer

Continuous capillaries; very restricted permeability

Question 20

Which of the following best describes the effect of increased carbon dioxide detected by central chemoreceptors in the medulla oblongata?

Accepted Answer

Vasodilation in cerebral vessels, systemic vasoconstriction, and increased respiratory rate

Blood Vessels and Circulation: Structure, Function, and Regulation

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