physio

• Jx= Px A (C1-C2)
• permeability coef x surface area x driving force

• TBW= 60% body weight
• ECV= 40% TBW
• ICV= 60% TBW

H2O or antipyrine injection

V(TBW)= (V(antipyrine) x C (antipyrine)) / C (TBW)

inulin or mannitol

**mannitol can also pull H2O out of brain tissue, lowering intracranial pressure**

albumin 125 or Evans blue dye

• 1= not permeable
• 0= freely permeable

- fibers to sweat glands and some blood vessels in skin and SkM (which cause vasodilation instead of constriction)