cell volume regulation

Question 1

movement across membranes for uncharged substances

Answer 1

move accord to concentration gradients

Question 2

osmotic pressure

Answer 2

compare inside and outside to see if cell will shrink or swell

Question 3

3 ways cells keep from swelling and bursting

Answer 3

impermeable to water, cell walls, and regulation of solutes

Question 4

impermeable to water

Answer 4

some special cells have low water permeability such as sweat glands and kidney cells. Maintains inernal solute concentration, but cells have problems growing

Question 5

cell walls

Answer 5

use hydrostatic force to counter osmotic force. Plants, fungus, and some bacteria do this. Requires considerable metabolic resources and greatly limits shape

Question 6

osmotic control

Answer 6

animals control swelling by having semi-permiable membranes, and using proteins they regulate the solute molecules in the ECF and ICF, thus comtrolling water flow

Question 7

diffusion

Answer 7

movement of random thermally-agitated molecules

Question 8

osmosis

Answer 8

net inward movement of water across a semi-permeable membrane is osmosis

Question 9

reflection coeffecient

Answer 9

water = 0, inpermeable = 1, with a coeffecient of .5 a molecule will exert half the ideal osmotic pressure of a non-permeating solute

Question 10

Osmolarity

Answer 10

total concentration of solute particles. (i.e. 1M CaCl2 is 3osM solution)

Question 11

molarity

Answer 11

moles of solute per liter of solution

Question 12

equivalents

Answer 12

osM = osM

Question 13

tonicity

Answer 13

effect of a solution on a cell. (ie cells shrink in hypertonic solution)