Fluid Shifts Between Compartments — Flashcards

Flashcard 1: On average, _____ fluid is 20% of body weight

Answer: extracellular

Flashcard 2: Which fluid compartment has a higher **percentage** of body weight in infants than in adults, but a smaller **absolute volume**?

Answer: ECF (Extracellular Fluid)

Extra: In infants, ECF constitutes about 40% of body weight, whereas in adults it is about 20%. Despite this higher percentage, the absolute volume (in liters) of ECF is much smaller in infants due to their smaller total body mass. Note: ICF percentage is lower in infants (~35%) than in adults (~40%).

Flashcard 3: Extracellular fluid is divided into _____ (75% of ECF) and plasma (25% of ECF)

Answer: interstitial fluid

Flashcard 4: Interstitial fluid pressure is positive in encapsulated organs- _____

Answer: kidney, skeletal muscle (2)

Flashcard 5: On average, _____ fluid is 40% of body weight

Answer: intracellular

Flashcard 6: The total number of osmotically active particles is expressed in units called _____.

Answer: osmoles

Extra: Osmolarity is the concentration of osmotically active particles expressed as osmoles per liter (Osm/L). Osmolality is the concentration expressed as osmoles per kilogram of solvent (Osm/kg).

Flashcard 7: _____ and inulin are the indicators used for the measurement of intracellular fluid volume.

Answer: Deuterium oxide

Flashcard 8: Osmoreceptors that control osmolality of body fluids are located in _____ hypothalamus.

Answer: anterior

Flashcard 9: What is the following equation also called? _____

Answer: Gibbs-Donnan equation

Flashcard 10: Diarrhea is a cause of _____-osmotic volume contraction

Answer: iso