The fluid compartment consists of fluid contained within all cells in the body and contains 2/3 of the body water in healthy adults. the fluid compartment contains the remaining 1/3 of body water, including the interstitial or tissue spaces and blood vessels.

intracellular; extracellular

Explanation:

Intracellular fluid compartment is system which includes all the fluid which is enclosed in the cells by the plasma membranes of these cells. It lies in the cells and acts as the principal component of cytoplasm. ICF makes up about 2/3 of total water in human body.

Extracellular fluid is system which surrounds all the cells in body. The fluid has two primary constituents which are - fluid component of blood (known as plasma) and interstitial fluid (IF) which surrounds all the cells except blood. It accounts for other 1/3 of water content of the body.

its going to be mutualism cuz they both benefit from the relationship.

~batmans wife dun dun