Ch 5 Membrane Dynamics

Question 1

Disequilibrium of fluids

Answer 1

Uneven distribution of solutes in body fluids.

Question 2

Electrical disequilibrium

Answer 2

Many body solutes are ions. Negative ions in intercellular fluid an positive in extra cellular fluids.

Question 3

Goal of homeostasis

Answer 3

Maintain a dynamic steady state . Not the same as equilibrium

Question 4

Intracellular fluid

Extra cellular fluid

Answer 4

2/3 of total body water.

1/3

Question 5

Osmosis

Answer 5

Water moves to dilute the more concentrated solution

Question 6

Osmolarity

Answer 6

Molarity• number of particles

Question 7

Normal osmolality

Answer 7

280-290 milliosmols per liter

Question 8

Tonicity

Answer 8

Describes how that solution would affect cell volume if the cell were placed in the solution and allowed to come to equilibrium

Question 9

Diffusion

Answer 9

Movement of molecules from high to low concentrations

Question 10

Diffusion charistics

Answer 10

1) passive process
2) move from high to low concentration
3) net movement occurs until equal everywhere
4) diffusion is rapid over short distance , much slower over long
5) directly proportional to temp
6) inversely proportional to molecule weight and size

Question 11

Membrane protein 4 major functions

Answer 11

Structural
Enzymes
Receptors
Transporters

Question 12

Primary active transport

Answer 12

Uses ATP to move again gradient

Question 13

Secondary active transport

Answer 13

Uses potential energy stored in concentration gradient of one molecule to move other molecules against their gradient

Question 14

Flicks law of diffusion

Answer 14

Rate is proportional to
Surface area
Concentration gradient 
Permeability 
Thickness

Question 15

Symport

Anti port

Answer 15

More than one substance same direction

Two substances different direction

Question 16

Charge of cells

Answer 16

Negative