Fluid distribution Flashcards
What percentage of a young woman is water
50 %
what percentage of a young man is water
60 %
what is the approximate volume of intracellular fluid
25L
what is the approximate volume of interstitial fluid
12L
what is the approximate volume of plasma
3L
name some common non electrolytes
glucose, lipid, creatinine, urea
what is an electrolyte
dissolves in water to form charged particles
why do electrolytes have greater osmotic power than non electrolytes
they form more particles
what are the differences between ICF and ECF
ICF has low sodium and chloride and high potassium and phosphate and proteins
ECF has high sodium chloride
plasma has high proteins (anions) and low chloride because it is also an anion
what causes fluid to move between different compartments
hydrostatic pressure
oncotic pressure
active tranport
lymphatics
how does the body lose water
persperation
breath
faeces
urine
how does the body gain water
water
food
metabolism
what stimulates osmoreceptors in the hypothalamus
increase osmolarity
increase Na concentration of the plasma
what do the osmoreceptors in the hypothalamus stimulate
posterior pituritary to release ADH
what does ADH target
collecting ducts of the kidneys
how does ADH change the plasma
decreases the osmolarity and increase volume
what stimulates the baroreceptors in atria and large vessels
decreased plasma volume and decreased blood pressure
what do kidney juxtoglomerular cells stimulate when they sense a fall in blood pressure
RAAS system which stimulates the hypothalamic thirst center
what are the 3 fluid compartments
intracellular - 25L
plasma - 3L
interstitial -12L
