Fluid/Electrolyte/acid Base Balance

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Fluid Electrolyte Balance

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A molecule that is polar and  attracts water and easily dissolves in water.
molecule that don't dissolve in water because they are nonpolar (lipids)
part of plasma membrane with hydrophilic heads and hydrophobic tails facing inward, sandwich style. Impermeale to hydrophilic molecules, ions  used for salt and pH balance must be pumped in using ion protein pumps.
2/3 of our fulids in ICF. chemical reactions for metabolism happen here, overall negative charge. Major molecules: Mg+, **K+**, PO3^4-
all body fluid outside of the cells. 1/3 of our fluid. Major molecules: **NA+**, NACO3-, Cl-
interstital fluid
Fluid outside of the 80% of our ECF is interstitial. 
Hydrostatic pressure
forces fluid out of a space due to pressure. 
osmotic pressure
fluid flows into a space via osmosis (presence of solutes)
movement of water from an area of lower solute concentration to an area of higher concentration
unit of concentration, measured in Osmoles per Liter (think moles from chemistry)
water balance
daily water intake must equal output. water gain vs. water loss.
water gain
in hypothalmus monitor ECF osmolarity and when it gets too high, it stimulates the cortex to create thirsty sensation. Which also stimulates hypothalmus to release ADH. ADH stimulates kidney aquaporin production to release water and lower osmolarity

The kidneys function to absorb more water if dehydrated (make urine more concentrated), which will eventually trigger osmoreceptors to start loop again... NEGATIVE FEEDBACK
water loss
negative feedback loop between hypothalmus and kidneys. kidneys reabsorb water if too much water and dilute/excrete in urine, and absorb if dehydrated, making uring more concentrated to conserve water.
sensible/insensible water loss
sensible - noticeable, sweat, urine, feces, etc.
insensible - light perspiration, and respiration.