Ch 26 - Fluid Balance Flashcards
(50 cards)
fluid, electrolyte, and acid base balance is
water in the body, water movement, and 7.35-7.45
most water exists where and how much
ICF, 66%
how much water is in ECF
33%, has two sub compartments
2 compartments of the ECF
plasma, non living
interstitial fluid, living (lymph, CSF, humors, serous fluid, and synovial fluid)
body fluids are composed of
electrolytes and non electrolytes
electrolytes are
anything that dissociates into ions in water, has pos or neg charge, most abundant is solutes. more responsible for fluid shifts or movement of water/ INORGANIC SALTS, ACIDS BASES N SOME PROTEINS
why are electrolytes more responsible for fluid shift/water movement
bc of the dissociation, water cares for number of solute and going high to low. EX NaCl will dissociate and make stuff move
non electrolytes
do not dissociate in water, no charge, make up body fluid bulk. ex; glucose, urea, lipids
for Important electrolytes to keep track of
Na+, K+, HCO3-, Cl-
where is Na+ most concentrated
ECF
where is K+ most concentrated***
ICF
HCo3- most concentrated where
ECF
Cl- mostly concentrated where
ECF
changing osmolarity of one compartment leads to what
net water flow, water moves freely but solutes do not. ECF and ICF will keep solutes where they are so water won’t move
optimal body water content depends on
age, body mass, sex, body fat %
age and body water content, sex and body fat too
age- infants and kids have more water they need it to grow
sex- males have more water bc testosterone and muslce growth
body fat- adipose is least hydrated of tissues, less water in fat ppl
water intake comes from
ingested food and liquid as well as metabolic water.
metabolic water
32 ATP and 6 water from this
insensible water loss
lungs and skin, water vapor
sensible water loss
sweat, urine, feces
should water intake = water output
yes, when properly hydrated
why is it important for water intake = water output
bc allows body to maintain 300 mOsm osmolality
hypothalamic thirst center controls what
the thirst mechanism
what is the thirst mechanism activated by
-osmoreceptors, which detect changing ECF osmolality
-dry mouth, salivary glands cannot draw water from blood to produce saliva
-decreasing BV and BP 5-10% drop initiates thirst mechanism, baroreceptors send information
