Water is a major component of the human body. On average, about 60% of the adult body is made up of water.
A 70-kg man is made up of around 42 litres of total water, and it will be ~distributed as follows:
1. Intracellular water (within cells) -28 litres
2. Extracellular fluid – 14 litres, comprising of:
- Interstitial fluid (lymph included), which is an aqueous medium surrounding cells – 10 litres
- Blood plasma- 3 litres
- Transcellular fluid (cerebrospinal fluid, ocular, pleural, peritoneal and synovial fluids) – 1 litre