Formulas

Question 1

System in series

Answer 1

R_total = R₁ + R₂

Question 2

Change in Pressure

Answer 2

∆P = flow x Vascular resistance

Question 3

Conductance

Answer 3

Conductance = 1 / Resistance

Question 4

Cross section

Answer 4

xsect = π (d/2)² x (amount)

Question 5

Net filtration Pressure

Answer 5

NFP = (P_c - P_ISF) - ∂(π_c - π_ISF)

∂ = 1 if membrane impermebale to proteins
∂ = 0 if membrane permeable to proteins

Question 6

Flow (GFR)

Answer 6

Flow = K_F x NFP

Question 7

K_F =

Answer 7

12.5 ml/min/mmHg

Question 8

Excretion rate

Answer 8

ER = V x U

V = urine excretion rate
U= urine concentration of compound

Question 9

Renal Clearance
GRF with inulin
Effective Renal Plasma

Answer 9

Clearance = (V x U) / P

V = urine excretion rate
U= urine concentration of compound
P= Plasma concentration of compound

Question 10

Clearance ratio

Answer 10

Clearance ratio = Clearance / Clearance_inulin

Question 11

Excretion

Answer 11

Excretion = filtration - reabsorption + secretion

Question 12

Renal Plasma Flow

Answer 12

RPF = 0.60 x Renal Blood Flow

Remember Hct = 0.40

Question 13

Filtration Fraction

Answer 13

FF = GFR / Renal Plasma Flow

Question 14

Velocity of blood flow

Answer 14

Velocity = (blood flow) / (xsec area)