TEST 4 part 3
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what are the nitrogenous wastes?
ammonia, uric acid, urea, creatinine
how much of the filtered water does the kidney return to the circulation?
what is the purpose of the loop of Henle?
to create a salinity gradient in the medulla which raises the osmolarity and causes reabosrption of water from the collecting duct
hormones that influence kidney function act on _____.
- distal DCT
- collecting duct
how is water conserved in the collecting duct?
the collecting duct runs through the highly saline, highly osmolar medulla which pulls water out of the duct (when ADH is present)
what is the ureter?
the tube that carries urine from the renal pelvis to the bladder
what is the bladder?
a hollow muscular storage organ for urine
the function of urination is initated by ______.
stretching the detrusor muscle
the collecting duct can conserve water because ______.
- although it is normally impermeable to water
- ADH makes it permeable to water, but not to sodium so water alone is reabsorbed
what is thrist?
a hypothalamic signal to drink triggered by rising serum oslomarity
what is the difference between dehydration and volume depletion?
- depletion- sodium and water lost in equal amounts
- dehydration- water loss without sodium loss
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