<prompt> Smallest fluid compament of body is:IntracellularTranscellularExtracellularInterstitial  <response>: Transcellular fluid is the fluid in the lumen of The structures lined by epithelium. It is about 1 L i.e 15 mlkg of body weight. Interstitial fluid is a pa of ecf . It consists of fluid that is outside the vascular system i.e lymph and it constitutes two to three percent of the total body weight. Extracellular fluid constitutes 20 of body weight Intracellular fluid constitutes 40 of body weight 