Intro Flashcards
KCL
expands extracellular by pumping K into cells and Na out–>water follows
Nacl is ____ to plasma
isotonic; does not enter cells
what is the charge on the basement membrane?
negative
creatinine is a good marker of
GFR because it is secreted but not reabsorbed
what is reabsobed in PT?
Na
glucose (almost all)
HCo3
Descending LOH
permeable to water–dilutes
ascending portion
Na out of urine via Na/K/2Cl transporter –> concentrates Na in medulla WITHOUT water
*loops block it
DCT
reabs NaCl with NaCl co-transporter–urine becomes dilute
also reabs Ca
*thiazides block
and increased Ca reabs with thiazides
Collecting Duct principal cells
aldosterone dep Na channels that are blocked by K sparring diuretics
CD + ADH
ADH increases permeability via increasing aquaporins
intercalated cells in CD
acid secretion
CD is also a major site of
K secretion
A2 and Bicarb
A2 increases HCO3 reabs in PT
vascular diseases early on and later
early on: change in GFR but not filtration barrier or tubular fx so urine content is normal
later: protein starts t get in urine, creatinine retained
tubulointerstitial disease
affect tubular function, so produce abnormal urine composition while GFR is maintained
eventually tubular necrosis will block flow and decrease GFR