Question 1

Which of the following best describes the primary mechanism by which oxygen and carbon dioxide move across the capillary endothelium?

Accepted Answer

Diffusion down their concentration gradients

Question 2

A patient with severe malnutrition develops edema. Which of the following best explains the physiological basis for this condition?

Accepted Answer

Decreased plasma protein concentration reduces colloid osmotic pressure

Question 3

Which equation correctly represents the relationship between filtration, reabsorption, and lymph flow in capillary fluid exchange?

Accepted Answer

$$Filtration = Reabsorption + Lymph\ Flow$$

Question 4

Which type of capillary is most likely to be found in the kidneys and intestines, and what is its distinguishing feature?

Accepted Answer

Fenestrated capillary; large pores between endothelial cells

Question 5

A patient with heart failure develops tissue edema. Which of the following changes in capillary dynamics is most responsible for this?

Accepted Answer

Increased capillary hydrostatic pressure

Question 6

Which of the following substances is most likely to be transported across capillary endothelium by transcytosis?

Accepted Answer

Plasma proteins

Question 7

Which of the following best describes the role of the lymphatic system in fluid homeostasis?

Accepted Answer

It returns fluid and proteins filtered out of capillaries to the circulatory system

Question 8

Which pressure gradient is primarily responsible for net filtration at the arterial end of a capillary?

Accepted Answer

Hydrostatic pressure

Question 9

If a patient has excessive leakage of proteins out of blood vessels, what is the most likely effect on capillary fluid exchange?

Accepted Answer

Decreased colloid osmotic pressure and increased net filtration

Question 10

Which of the following is NOT a major cause of tissue edema?

Accepted Answer

Increased absorption at the arterial end of capillaries

Question 11

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

Accepted Answer

Capillaries have the largest total cross-sectional area

Question 12

Which of the following is a correct statement about continuous capillaries?

Accepted Answer

They are found in muscle, connective tissue, and neural tissue

Question 13

Which process is responsible for the mass movement of fluid between plasma and interstitial fluid due to pressure gradients?

Accepted Answer

Bulk flow

Question 14

A patient with blocked lymphatic drainage is most likely to experience which of the following?

Accepted Answer

Edema due to accumulation of interstitial fluid

Question 15

Which of the following best describes the effect of increased interstitial protein concentration on capillary fluid exchange?

Accepted Answer

It decreases colloid osmotic pressure gradient and increases net filtration

Question 16

Which of the following is the main force driving absorption of fluid into capillaries at the venous end?

Accepted Answer

Colloid osmotic pressure

Question 17

Which of the following scenarios would most likely result in increased net filtration from capillaries into the interstitial space?

Accepted Answer

Increased capillary hydrostatic pressure

Question 18

Which of the following is a function of the lymphatic system that is directly related to capillary exchange?

Accepted Answer

Returning filtered fluid and proteins to the circulatory system

Question 19

Which of the following best describes the movement of small dissolved solutes and gases across the capillary endothelium?

Accepted Answer

Diffusion, depending on lipid solubility and concentration gradient

Question 20

Which of the following would most likely decrease the risk of tissue edema?

Accepted Answer

Increased plasma protein concentration

Exchange Function of the Microcirculation: Capillary Structure, Transport Mechanisms, and Fluid Balance

Study Guide - Practice Questions