QCM : Fluid and Electrolyte Balance Essentials — 9 questions

Questions et réponses du QCM

1. What are fluid compartments in the context of body physiology?

Spaces within the body where water is stored and separated by membranes, including intracellular and extracellular spaces.
The areas in the body where electrolytes are stored and used for nerve conduction.
Different organs responsible for regulating body temperature and metabolic processes.
The regions in the body where blood is produced and circulated.

Spaces within the body where water is stored and separated by membranes, including intracellular and extracellular spaces.

Explication

Fluid compartments refer to the specific spaces within the body where water is stored and separated by cell membranes, primarily including intracellular fluid (inside cells) and extracellular fluid (outside cells). These compartments are essential for maintaining fluid balance and physiological functions.

2. What percentage of total body water (TBW) is typically found within cells (intracellular fluid) in adults?

Approximately 60%
Approximately 40%
Approximately 70%
Approximately 50%

Approximately 60%

Explication

Intracellular fluid (ICF) constitutes about 60% of TBW in adults, making it the majority component of body water, which is essential for cellular functions.

3. Which electrolyte is primarily responsible for regulating fluid volume and blood pressure in the body?

Chloride (Cl⁻)
Potassium (K⁺)
Sodium (Na⁺)
Calcium (Ca²⁺)

Sodium (Na⁺)

Explication

Sodium (Na⁺) is the primary extracellular electrolyte responsible for regulating fluid volume and blood pressure. It influences osmotic pressure and helps maintain blood volume, making it essential for cardiovascular stability. The other options, while important electrolytes, have different primary functions: potassium is mainly intracellular and vital for cardiac and muscle function; calcium is involved in bone health, blood clotting, and muscle contraction; chloride helps maintain osmotic pressure but does not primarily regulate blood pressure.

4. Which electrolyte is primarily responsible for regulating fluid volume and osmotic pressure in the extracellular compartment?

Potassium (K⁺)
Sodium (Na⁺)
Calcium (Ca²⁺)
Chloride (Cl⁻)

Sodium (Na⁺)

Explication

Sodium is the main extracellular electrolyte and plays a key role in regulating fluid volume and osmotic pressure, which are critical for maintaining blood pressure and fluid balance.

5. What is the primary role of regulation mechanisms in fluid and electrolyte balance?

To enable rapid cellular communication and signaling
To promote the excretion of waste products from the body
To maintain a stable internal environment despite external changes
To facilitate nutrient absorption in the gastrointestinal tract

To maintain a stable internal environment despite external changes

Explication

Regulation mechanisms, including hormonal controls like ADH and aldosterone, primarily serve to maintain homeostasis by stabilizing fluid and electrolyte levels in the body, despite external or internal fluctuations. This ensures physiological stability and proper organ function.

6. Which of the following hormones is involved in regulating fluid compartments by controlling sodium and water retention?

Aldosterone
Insulin
Thyroxine
Adrenaline

Aldosterone

Explication

Aldosterone promotes sodium retention in the kidneys, which in turn helps in conserving water and maintaining blood pressure, thus regulating extracellular fluid volume.

7. What percentage of extracellular fluid (ECF) is plasma compared to interstitial fluid?

Approximately 75%
Approximately 25%
Approximately 50%
Approximately 90%

Approximately 25%

Explication

Plasma accounts for about 25% of ECF, with the remaining 75% being interstitial fluid, which surrounds tissue cells and facilitates nutrient and waste exchange.

8. Which laboratory measurement is most useful for assessing a person’s hydration status and electrolyte balance?

Serum osmolality
Blood glucose level
White blood cell count
Hemoglobin concentration

Serum osmolality

Explication

Serum osmolality reflects the concentration of solutes in blood and is a key indicator of hydration status and electrolyte balance, especially in cases of dehydration or overhydration.

9. In the context of fluid compartments, what does osmolality influence?

Water movement between compartments
Blood clotting
Lymphatic drainage
Nutrient absorption

Water movement between compartments

Explication

Osmolality determines the movement of water between compartments through osmosis; water shifts from areas of lower osmolality to higher osmolality to balance solute concentrations.

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Fluid compartments — division?

Intracellular and extracellular spaces

Total Body Water — percentage?

Approximately 60% of adult weight.

Electrolyte functions — role?

Regulate nerve, muscle, and fluid balance

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