Identify the FALSE statement regarding total body water compartments?

UPUMS Nsg officer-2023

Applied Physiology

Easy

Appeared in: UPUMS Nsg officer-2023

Explanation

The statement that intravascular fluid contributes 16% of body weight is incorrect.
Intravascular fluid, which is the plasma within blood vessels, makes up only about 4-5% of the total body weight.
The value of approximately 15-16% corresponds to the interstitial fluid compartment, which is the fluid surrounding the cells, not the fluid within the blood vessels.
Therefore, this statement misrepresents the actual proportion of intravascular fluid in the body.

Option A: This is a true statement. Intracellular fluid (ICF), the fluid within the body's cells, is the largest fluid compartment.
Option B: This is a true statement. In an average adult, water constitutes approximately 60% of the total body weight.
Option D: This is a true statement. Extracellular fluid (ECF), all the fluid outside the cells, accounts for about 20% of total body weight.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Distribution of total body water into fluid compartments as background academic context rather than a clinical decision trigger.
Understanding fluid compartments is fundamental for nurses to manage fluid and electrolyte balance, administer IV therapy correctly, and assess patient conditions like dehydration, edema, and shock.
For instance, a patient with hemorrhage loses intravascular fluid, leading to hypovolemic shock. A nurse's priority is to restore this specific volume with IV fluids.
In contrast, a patient with heart failure may develop edema, which is an excess of fluid in the interstitial compartment, requiring different interventions like diuretics.

How to Approach the Question

First, recognize that the question asks you to identify the FALSE statement. This means three of the options will be factually correct.
Recall the basic '60-40-20 rule' for body fluid distribution in an average adult: 60% of body weight is total water, 40% is intracellular fluid (ICF), and 20% is extracellular fluid (ECF).
Evaluate the options against this primary rule. Options stating 'Body is composed of 60% water', 'Intracellular fluid contributes to 40% of body weight', and 'Extracellular fluid contributes to 20% of body weight' are likely true.
Next, recall the subdivisions of the ECF. The ECF (20%) is mainly composed of interstitial fluid (about 15%) and intravascular fluid/plasma (about 5%).
Check the remaining option against this secondary rule. The statement 'Intravascular fluid contributes 16% of body weight' clearly contradicts the known value of ~5%.
Conclude that this statement is the false one and therefore the correct answer to the question.

Concept Tested & Keywords

Concept Tested: Distribution of total body water into fluid compartments.
Stem keywords: total body water, compartments, body weight
Lead-in keywords: FALSE statement
Negative lead-in flag: The question asks to identify the FALSE statement among the options.

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