Similarity: (1) are all liquid environments, which together form extracellular fluid and provide living environment for cells.

(2) Similar components

Difference: (1) Living cells are different, and interstitial fluid is the environment in which tissue cells live directly; Plasma is the living environment of blood cells; Lymph is the environment where lymphocytes and phagocytes live directly.

(2) They live in different environments: interstitial fluid exists between tissues and cells, also called interstitial fluid; Plasma exists in capillaries; Lymph exists in lymphatic capillaries.

(3) protein content is different: protein in plasma is more than protein in lymph and tissue fluid.