Osmosis Flashcards Preview

Bio 364 Lecture Exam 1 > Osmosis > Flashcards

Flashcards in Osmosis Deck (26):
1

what is osmosis?

diffusion of H2O occuring across a membrane of some sort

2

define diffusion

mvmt of a substance from an area of high concentration to an area of low concentration

3

what is the difference between two points (across a membrane called)

concentration or density gradient

4

define viscosity

how easily the liquid flows

5

how does temp affect osmosis/diffusion?

warmer liquids move faster
warmer membranes are more permeable

6

how does size of molecule affect diffusion?

larger molecules may not fit through the membrane pores

7

how does water move in osmosis?

from an area of LOW concentration of solute to an area of HIGH concentration of solute
OR
from an area of HIGH concentration of water to an area of LOW concentration of water

8

what is the difference between solute and solvent

solute is what is dissolved in the solvent

9

water moves from an area of ______ concentration of water to an area of ______ concentration of water

from high to low

10

water moves from an area of ______ concentration of solute to an area of _______ concentration of solute

from low to high

11

solute + solvent

solution

12

define osmotic pressure

the force required to prevent water from moving across a membrane by osmosis

13

what type of solution has the same concentration of particles?

isosmotic

14

what type of solution has a greater concentration of solutes (compared to the solution on the inside of the membrane)?

hyperosmotic

15

what type of solution has a lesser concentration of solutes (compared to the soln inside the membrane)?

hyposmotic

16

RBC in a hypotonic solution will

lyse

17

RBC in a hypertonic solution will

shrivel/dehydrate/CRENATION

18

tonicity terms refer to H2O mvt with regard to

cells

19

in an isotonic soln the cell

neither shrinks nor swells

20

in a hypertonic soln the cell

will shrink because water moves out of the cell

21

in a hypotonic soln, the cell

will swell (possible lysis) because water moves into the cell

22

in an osmosis problem, at time zero, what is named?

osmolarity

23

in an osmosis problem what is named 2nd?

tonicity

24

with non diffusable solute, the tonicity prefix is the same as the

osmolarity prefix

25

what is the molarity of cytoplasm

0.3 M of any non salt (like gl or starch)
0.16 M of NaCl

26

what is the percent of normal NaCl in cytoplasm?

0.9%