Physiological fluid compartment

Physiological fluid compartments are the major divisions of body water in humans, classified as intracellular fluid (ICF), which is inside cells, and extracellular fluid (ECF), which is outside cells[1][5][3]. The ECF is further subdivided into interstitial fluid (between tissues), blood plasma (within blood vessels), lymph, and transcellular fluids (e.g., cerebrospinal, synovial, pleural fluids)[1][3][5][6]. These compartments are essential for maintaining homeostasis, enabling the passive and regulated movement of water and electrolytes across semipermeable membranes, and supporting all cellular and systemic physiological processes[7][8][9]. Pathological shifts in fluid between compartments underlie many clinical syndromes, but the compartments themselves are not molecular targets; rather, drugs and interventions are aimed at processes (renal function, osmotic balance, vascular permeability) that modulate fluid behavior[1][5][7]. Additional context: - ICF typically holds about two-thirds of total body water and houses metabolic processes[1][5][6][7]. - ECF includes plasma (about 25% of ECF) and interstitial fluid (about 75% of ECF)[5][7]. - Fluid moves passively (osmosis) and actively between compartments to maintain equilibrium[2][9]. - These concepts are fundamental in medical disciplines such as critical care, nephrology, and pharmacotherapy[1][5]. Summary: "Physiological fluid compartments" is a foundational physiological concept, not a receptor, protein, or direct drug target. Please clarify or specify if you meant a molecular entity within a compartment (e.g., aquaporin, sodium-potassium pump) for structured molecular information.

Other names

Body fluid compartmentFluid compartmentCompartmental body fluids