Flashcards in Lecture 2-Membrane Transport Deck (13):

1

## Kinetic energy

### The energy of movement. It is also related to thermal energy. ^ thermal energy = ^ kinetic energy. ^ KE also produces ^ TE.

2

## What is "diffusion?"

### The movement of a solute down its [ ] gradient from high to low. Does not require any transport mechanisms (like channels)

3

## Describe osmosis

### The movement of a solvent (usually water) down its concentration gradient so it will dilute a high [solute].

4

## What is the formula for osmotic pressure?

###
(g)x(c)xRT

g=particles in slxn (osm/L)

c= [ ] (mol/L)

RT= gas constant x temperature

5

## What is "Effective osmotic pressure?"

### The osmotic pressure as determined by how permeable a membrane is to a given ion. (Eff. Osm. P= δ×π)

6

## What is δ?

### The "reflection coefficient." It is a measure of permeability and, therefore, how much an ion contributes to osmotic pressure.

7

## List the E* independent forms of cellular transport.

### Osmosis, diffusion, facilitated transport.

8

## What do the E* independent types of transport require?

### Some type of carrier protein.

9

## What is the main difference between primary and secondary active transport?

### WHEN ATP is used for energy.

10

## What 3 factors affect rates of diffusion?

### Concentration differences, pressure differences, electrical potential (Nernst equation)

11

## What 3 factors increase plasma membrane permeability and, therefore, increase diffusion?

### Increased lipid solubility, decreased P.M. thickness, decreased solute size

12

## What is the equation for measuring diffusion?

###
J=PA(Co-Ci)

P=permeability

A= area

C

13