Question 1

Which of the following best describes the primary function of capillaries in the circulatory system?

Accepted Answer

To permit the exchange of nutrients and wastes between the blood and tissue cells through interstitial fluid.

Question 2

A patient presents with swelling in the lower limbs due to increased capillary hydrostatic pressure. Which of the following best explains the mechanism behind this edema?

Accepted Answer

Increased capillary hydrostatic pressure pushes more fluid out of the capillaries into the interstitial space.

Question 3

Which of the following equations correctly represents the relationship between blood flow (F), pressure gradient (ΔP), and peripheral resistance (R)?

Accepted Answer

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

Question 4

Which vessel type is characterized by the presence of valves and a thinner tunica media compared to its counterpart?

Accepted Answer

Veins

Question 5

A sudden decrease in blood pressure is detected by baroreceptors. What is the immediate response of the cardiovascular system?

Accepted Answer

Increase in cardiac output and widespread vasoconstriction.

Question 6

Which of the following changes would most significantly increase vascular resistance?

Accepted Answer

Halving the diameter of a blood vessel.

Question 7

Which hormone is released in response to low blood pressure and stimulates vasoconstriction, thirst, and the release of aldosterone and ADH?

Accepted Answer

Angiotensin II

Question 8

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

Accepted Answer

Sinusoid

Question 9

During heavy exercise, which of the following best describes the redistribution of blood flow?

Accepted Answer

Blood flow to skeletal muscles increases dramatically.

Question 10

Which of the following best describes the effect of increased sympathetic stimulation on a medium-sized artery?

Accepted Answer

Vasoconstriction due to contraction of smooth muscle in the tunica media.

Question 11

A patient with severe dehydration will likely experience which of the following changes in capillary exchange?

Accepted Answer

Increased blood colloidal osmotic pressure, leading to recall of fluids into the bloodstream.

Question 12

Which of the following is a direct effect of the release of atrial natriuretic peptide (ANP)?

Accepted Answer

Increased sodium loss and water loss by the kidneys, reducing blood volume.

Question 13

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

Accepted Answer

Capillaries have the largest total cross-sectional area.

Question 14

Which of the following is the correct sequence of blood flow through the pulmonary circuit?

Accepted Answer

Right ventricle → pulmonary trunk → pulmonary arteries → alveolar capillaries → pulmonary veins → left atrium

Question 15

Which of the following is a function of arterial anastomoses?

Accepted Answer

They provide alternate routes for blood to reach a tissue or organ.

Question 16

Which of the following best describes the effect of turbulence in blood flow?

Accepted Answer

It increases resistance and slows blood flow.

Question 17

Which of the following is true regarding the distribution of blood in the body at rest?

Accepted Answer

Most blood is found in systemic veins and venules.

Question 18

Which of the following is the main determinant of systemic vascular resistance?

Accepted Answer

Diameter of the blood vessel

Question 19

Which of the following is a long-term response to blood loss?

Accepted Answer

Increased secretion of erythropoietin (EPO) to stimulate red blood cell production

Question 20

Which of the following best describes the process of angiogenesis?

Accepted Answer

Growth of new blood vessels from pre-existing vessels.

Blood Vessels and Circulation: Structure and Function

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