Body Fluid Compartments Lecture Notes PDF

Body fluid compartments  Distribution of total body water (TBW): The TBW normally averages 40 liters in young adults which is distributed as follows: (1)- Intracellular fluid (ICF) (2)- Extracellular fluid (ECF) a) b) Intravascular fluid (plasma) Extravascular fluid Body fluid compartments (1)-Intr...

Body fluid compartments  Distribution of total body water (TBW): The TBW normally averages 40 liters in young adults which is distributed as follows: (1)- Intracellular fluid (ICF) (2)- Extracellular fluid (ECF) a) b) Intravascular fluid (plasma) Extravascular fluid Body fluid compartments (1)-Intracellular fluid (ICF): This constitutes about 2/3 of the TBW (about 40% of the body weight). It averages 25 liters. Body fluid compartments (1)-Intracellular fluid (ICF): Composition: The intracellular fluid contains: Cations: potassium (K+) as the chief cation & Small amount of Mg+2, Na+ & Ca+2. Anions: phosphates and protein as the main anions & Small amount of Cl&bicarbonate (HCO3-). Body fluid compartments (2)- Extracellular fluid (ECF): This constitutes about 1/3 of TBW (about 20% of the body weight). It averages 15 liters. Body fluid compartments (2)- Extracellular fluid (ECF):. Composition: The extracellular fluid contains: Cations: Sodium (Na+) as the chief cation & small amount of K+ , Ca++ & Mg++. Anions: chlorides (Cl-) as the main anion & smaller amount of bicarbonate, protein & phosphates. Body fluid compartments (2)- Extracellular fluid (ECF): It includes the following subdivisions: a) Intravascular fluid (plasma): -This constitutes about 5% of the body weight -It averages 3 liters. Body fluid compartments (2)- Extracellular fluid (ECF): b) Extravascular fluid: -This includes interstitial fluid (tissue fluid) and transcellular fluids (cerebrospinal & intraocular fluids, and fluids in joints, pleura, peritoneum, etc...). -It constitutes about 15 % of body weight. - It averages 12 liters.