Interstitial fluid comes from blood plasma which leaks out of the pores of capillaries. It differs in that the larger molecules mostly proteins and blood cells are too large to fit through the pores, and so the interstitial fluid lacks these. The interstitial fluid does contain the salts and the smaller molecules such as amino acids, sugars, fatty acids, coenzymes, hormones, neurotransmitters, which are present in blood plasma.
Chat with our AI personalities