Lecture 2-Membrane Transport Flashcards Preview

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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

What are the two types of molecular movement?

Thermal & kinetic