PHGY 209 Lecture Notes - White Blood Cell, Mannitol, Hydrophile

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The milieu interieur of the body comprises various body fluids, which each have important characteristics. These body fluids help maintain homeostatic control within the body in a cyclic manner: Water is the universal solvent in the body, and is usually the most abundant compound found in the body. Depending on various factors, body water makes up beteen 45% and 75% of total body mass. The polarity and electronegativy of the water molecule make it very biologically significant. Solutes such as ions, oxygen and small organic compounds are dissolved. Metobic reactions take place: hydrolysis uses water to break down larger macromolecules into smaller components, dehydration releases water by building larger molecules from smaller ones. Water is also able to travel through the compartments of the cell by a process called osmosis, which will be discussed later. Any significant variation in water level could cause disturbances in homeostasis.

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