water, electrolyte, acid-base balance Flashcards
the two inorganic components
water and minerals
the inorganic substances that dissociate in body fluids to form ions
minerals
the ions formed in minerals
electrolytes
extracellular fluid and intracellular fluid are called what
fluid compartments
when water content remains stable over time; water gains equal water losses
fluid balance
where does water gains occur
digestive tract
where does water losses mostly occur
urination
a reduction in the water content of the body that develops when water losses outpace water gains; the osmotic concentration of plasma increases
dehydration
a rapid movement of water bw the ECF and ICF in response to an osmotic gradient
fluid shift
the state of the body in which ion gains and losses are equal
mineral balance
what is the significance of the body mineral, sodium
essential for normal membrane function
what is the significance of the body mineral, calcium
essential for normal muscle and neuron function and for normal bone structure
occurs across the epithelial lining of the small intestine and colon
ion absorption
occurs in the sweat gland secretions and kidney
ion excretion
primary site of ion loss
kidney
secondary site of ion loss
sweat gland secretions
when sodium gains equal sodium losses
sodium balance
when sodium gains exceed losses, the ECF volume does what?
increases
when sodium losses exceed gains, the ECF volume does what?
decreases
the secretion of this restricts water loss and stimulates thirst, promoting additional water consumption
ADH
causes increased urinary sodium retention and thus increases the sodium ion concentration in the ECF
aldosterone
responsible for regulating the potassium ion concentration of the ECF
kidneys
what causes potassium excretion
- when potassium concentration rise in the ECF
- under aldosterone stimulation
- when the ECF pH rises
the rate of potassium entry across the digestive epithelium and the rate of potassium loss into urine
potassium balance
when the production of hydrogen ions is precisely offset by their loss, and when the pH of body fluids remains within normal limits
acid-base balance