Chp 2 Darcy's Law: Pressure-Driven Transport Through Membranes

Question 1

Define Plasma Membrane

Answer 1

a cell wall that is composed of a sandwich of two layers of phospholipid molecules facing each other, a bilayer.

Question 2

Define Selectively Permeable or semipermeable

Answer 2

the cell membrane selectively allows certain molecules to pass through, thereby regulating cell contents.

Question 3

What are the 3 main ways substances are transported through the cell membrane?

Answer 3

1. By fluid (or hydro-static) pressure
2. By Electro-chemical diffusion
3. By Active Transport

Question 4

Who is Dr. Willem Kolff?

Answer 4

the “father” of artificial organs. Developed artificial kidney, dialysis machine.

Question 5

What is Darcy’s Law formula?

Answer 5

Q = (kA ΔP)/μh

Q = flow rate (m^3/s)
k = permeability constant (m^2)
A = area (m^2)
ΔP = change in pressure (Pa)
μ = fluid viscosity ( kg/m*s)
h = thickness membrane (m)

Question 6

Describe Darcy’s Law

Answer 6

mathematical relationship between flow of fluid through porous obstruction and the pressure driving the flow.

Question 7

What is the Hydraulic (fluid) Resistance formula?

Answer 7

R = (μh)/(kA)

Question 8

What is the compact form of Darcy’s Law formula?

Answer 8

Q = ΔP/R

Question 9

What does MW stand for?

Answer 9

Molecular Weight

Question 10

What units is MW in?

Answer 10

1 Dalton (Da) = 1.661 x 10^-24 g