equations

Question 1

urine excretion rate of x

*2 equations

Answer 1

x= Ux * V

mEq/min

amount filtered-amount reabsorbed+amount secreted

Question 2

Ux

Answer 2

concentration/volume

mEq/L

Question 3

V

Answer 3

urine volume/ time

mL/min

Question 4

renal clearance (Cx)

Answer 4

(Ux*V)/ Px

mL/ min

Question 5

osmolar clearance (Cosm)

Answer 5

(Uosm*V)/Posm

Question 6

free water clearance (CH20)

Answer 6

V-Cosm

positive: peeing out more water than solutes

Question 7

obligatory urine volume (OUV)

Answer 7

minimum solute excretion per day/ maximum concentrating ability

L/day

Question 8

tubular reabsorption

Answer 8

amount filtered-amount excreted

mEq/day

Question 9

GFR

*2 equations

Answer 9

1) (Ux*V)/Px
2) Kf*Puf

180 L/day

Question 10

Kf (ultrafiltration coeffecient)

Answer 10

Lp*Sf

(hydrolic conductivity/endothelial permeability)* surface area

Question 11

filtration fraction (FF)

Answer 11

GFR/RPF

20%

Question 12

fractional excretion (FEx)

Answer 12

amount of X excreted/amount of X filtered

(Ux*V)/(Px*GFR)

Question 13

filtered load

Answer 13

Px*GFR

mEq/day

Question 14

net filtration pressure (Puf)

Answer 14

P_GC-P_BC-π_GC

10 mmHg