Q: A medical student is asked to calculate the percentage of extracellular fluid ($$ECF) in a $$person whose total body water ($$TBW) is 42 $$liters and $$ECF is 14 $$liters. Which formula should be used, and what is the correct answer?

$$\text{Percentage} = \frac{ECF}{TBW} \times 100 = \frac{14}{42} \times 100 = 33.3\%$$

Question 1

Which of the following best describes interstitial fluid in the context of human anatomy?

Accepted Answer

It is the fluid located between cells, forming part of the extracellular fluid.

Question 2

A patient is experiencing dehydration. Which compartment will lose water first as the body attempts to maintain homeostasis?

Accepted Answer

Interstitial fluid

Question 3

Which equation correctly represents the relationship between total body water ($$TBW$$), intracellular fluid ($$ICF$$), and extracellular fluid ($$ECF$$)?

Accepted Answer

$$TBW = ICF + ECF$$

Question 4

A researcher measures the concentration of sodium ions in different body fluids. In which compartment would you expect the highest concentration of sodium ions?

Accepted Answer

Interstitial fluid

Question 5

Which of the following is a function of extracellular fluid in the human body?

Accepted Answer

It acts as a medium for the exchange of nutrients and waste between blood and cells.

Question 6

A medical student is asked to calculate the percentage of extracellular fluid ($$ECF) in a $$person whose total body water ($$TBW) is 42 $$liters and $$ECF is 14 $$liters. Which formula should be used, and what is the correct answer?

Accepted Answer

$$	ext{Percentage} = \frac{ECF}{TBW} 	imes 100 = \frac{14}{42} 	imes 100 = 33.3\%$$

Question 7

Which scenario best illustrates the role of interstitial fluid in tissue health?

Accepted Answer

Oxygen diffuses from blood capillaries into interstitial fluid before entering cells.

Question 8

A patient with edema has excess fluid accumulation in which compartment?

Accepted Answer

Interstitial fluid

Question 9

Which of the following statements about extracellular fluid is correct?

Accepted Answer

It includes both plasma and interstitial fluid.

Question 10

A scientist is studying the movement of water between compartments. Which process primarily governs the movement of water from plasma to interstitial fluid?

Accepted Answer

Osmosis

Question 11

If a cell is placed in a hypotonic solution, what will happen to the cell and why?

Accepted Answer

The cell will swell because water enters the cell due to osmosis.

Question 12

Which of the following best explains why interstitial fluid is important for nutrient delivery?

Accepted Answer

It acts as a buffer zone between blood and cells, allowing nutrients to diffuse from capillaries to cells.

Question 13

A patient has a plasma sodium concentration of 140 mEq/L and an intracellular sodium concentration of 10 mEq/L. What does this difference indicate about sodium distribution?

Accepted Answer

Sodium is more concentrated in extracellular fluid than intracellular fluid.

Question 14

Which of the following is NOT a component of extracellular fluid?

Accepted Answer

Cytosol

Question 15

A doctor is treating a patient with severe burns. Why is monitoring extracellular fluid volume important in this case?

Accepted Answer

Burns can cause loss of extracellular fluid, leading to dehydration and shock.

Question 16

Which formula would you use to calculate the volume of interstitial fluid ($$IF) if $$you know the extracellular fluid ($$ECF) $$and plasma ($$P) $$volumes?

Accepted Answer

$$IF = ECF - P$$

Question 17

A patient receives an intravenous (IV) saline solution. Which compartment will the saline first enter?

Accepted Answer

Plasma

Question 18

Which of the following best describes the role of plasma in the body?

Accepted Answer

It is the liquid portion of blood that transports nutrients, hormones, and waste products.

Question 19

A nurse is monitoring a patient for signs of fluid imbalance. Which sign would most likely indicate excess interstitial fluid?

Accepted Answer

Swelling of tissues (edema)

Question 20

Which of the following statements about the movement of substances between plasma and interstitial fluid is correct?

Accepted Answer

Substances move freely between plasma and interstitial fluid through capillary walls by diffusion and filtration.

Fluid Compartments and Interstitial Fluid in Human Anatomy & Physiology

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