Question 1

Which of the following best describes the main structural difference between arteries and veins?

Accepted Answer

Arteries have thicker walls, more smooth muscle, and are more resilient than veins.

Question 2

Which type of capillary is most likely to be found in organs where rapid exchange of substances is necessary, such as the kidneys or endocrine glands?

Accepted Answer

Fenestrated capillaries

Question 3

A patient has a mean arterial pressure (MAP) of 90 mmHg, a diastolic pressure of 70 mmHg, and a systolic pressure of 110 mmHg. What is the pulse pressure, and does the MAP calculation match the formula $$MAP = diastolic\ pressure + \frac{pulse\ pressure}{3}$$?

Accepted Answer

Pulse pressure is 40 mmHg; MAP is 83.3 mmHg, which matches the formula.

Question 4

Which of the following mechanisms assists venous return to the heart, especially from the lower limbs?

Accepted Answer

Muscular compression and the respiratory pump

Question 5

If the net hydrostatic pressure (CHP - IHP) across a capillary wall is 15 mmHg and the net colloid osmotic pressure (BCOP - ICOP) is 25 mmHg, what is the net filtration pressure (NFP)?

Accepted Answer

$$NFP = (CHP - IHP) - (BCOP - ICOP) = -10\ mmHg$$

Question 6

Which hormone is released in response to decreased blood volume and acts to increase water reabsorption in the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 7

During heavy exercise, which of the following cardiovascular responses is most likely to occur?

Accepted Answer

Restriction of blood flow to nonessential organs and increased flow to skeletal muscles

Question 8

Which of the following best explains why veins are called capacitance vessels?

Accepted Answer

They can stretch and accommodate large volumes of blood with little change in pressure.

Question 9

A patient experiences a sudden drop in blood pressure due to hemorrhage. Which short-term compensatory mechanism is most likely to occur first?

Accepted Answer

Activation of baroreceptor reflexes to increase cardiac output and peripheral vasoconstriction

Question 10

Which of the following local factors would cause vasodilation in a tissue experiencing increased metabolic activity?

Accepted Answer

Release of nitric oxide (NO)

Question 11

Which of the following equations correctly describes the relationship between blood flow, pressure, and resistance?

Accepted Answer

$$Flow = \frac{\Delta P}{Resistance}$$

Question 12

Which of the following is a function of capillary exchange?

Accepted Answer

Transporting water and solutes between plasma and interstitial fluid

Question 13

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

Accepted Answer

Peripheral resistance increases

Question 14

Which hormone is released by the heart in response to excessive right atrial stretch and acts to reduce blood pressure and volume?

Accepted Answer

Natriuretic peptide

Question 15

Which of the following is the primary site of peripheral resistance in the cardiovascular system?

Accepted Answer

Arterioles

Question 16

Which of the following best describes the role of baroreceptors in cardiovascular regulation?

Accepted Answer

They monitor stretch and pressure in the walls of major arteries.

Question 17

A patient has a blood pressure of 120/80 mmHg. What is the mean arterial pressure (MAP)? Use the formula $$MAP = diastolic\ pressure + \frac{pulse\ pressure}{3}.$$

Accepted Answer

$$MAP = 80 + \frac{40}{3} = 93.3\ mmHg$$

Question 18

Which of the following would most likely occur if venous valves become incompetent?

Accepted Answer

Backflow of blood and development of varicose veins

Question 19

Which of the following is a direct effect of angiotensin II on the cardiovascular system?

Accepted Answer

Stimulation of aldosterone release, leading to sodium retention

Question 20

Which of the following best explains why capillaries are the primary site of exchange between blood and tissues?

Accepted Answer

They have a large total cross-sectional area and thin walls.

Blood Vessels and Circulation: Structure, Function, and Regulation

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