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Flashcards in chapter 5 section 1 Deck (23):
1

Movement across the cell membrane without any input of energy by the cell; Higher concentration to lower concentration.

Passive transport

2

movement of molecule from an area of higher concentration to an area of lower concentration

diffusion

3

difference in the concentration of molecules across a space

concentration gradient

4

when the concentration of the molecules of a substance is the same throughout a space

equilibrium

5

the ability of a molecule to diffuse across a cell membrane depends on.....?

the size and type of the molecule and on the chemical nature of the membrane.

6

molecules that are very small but not soluble in lipids, diffuse across the cell membrane by moving through.....?

pores of the membrane.

7

the process by which water molecules diffuse across a cell membrane from a n area of higher concentration to an area of lower concentration is...

osmosis

8

the concentration of solute molecules outside the cell is lower than the concentration in the cytosol, the solution outside is _______ to the cytosol; water diffuses into the cell

hypotonic

9

the concentration of solute molecules outside the cell is higher than the concentration in the cytosol, the solution outside is ______ to the cytosol; water diffuses out of the cell

hypertonic

10

the concentration of solutes outside and inside the cell are equal

isotonic

11

organelles that remove water; collect excess water and pump out of the cell; requires energy

contractile vacuole

12

pressure that water molecules exert against the cell wall is ____

turgor pressure

13

In a hypertonic environment; water leaves the cell through osmosis. Cells shrink away from the cell walls, and turgor pressure is lost

plasmolysis

14

bursting of cells

cytolosis

15

process used for molecules that cannot diffuse rapidly through cell membranes,.

facilitated diffusion

16

_______ assist in the movement of molecules across a cell membrane ; higher concentration to lower concentration

carrier proteins

17

channels that assist certain ions in diffusing across the cell membrane.

ion channels

18

substances that can pass through cell membranes by diffusion include _____?

oxygen

19

the contractile vacuole of a paramecium should be active when the paramecium is in

a hypotonic environment.

20

when a human red blood cell is placed in a hypotonic environment, it will

undergo cytolosis

21

facilitated diffusion is often used to transport

molecules that are not soluble in lipids.

22

Na + ions enter cells by

diffusing through Na+ ion channels.

23

what type of stimuli can cause the gates on ion channels to open or close

stretching of the cell membrane
electrical signals
chemicals in the cytosol or external environment