Biology Diffusion And The Cell Membrane Vocabulary

Front 1

diffusion

Back 1

the net movement of particles along the concentration gradient.

Front 2

Concentration gradient

Back 2

a difference in concentration of a particular particle on either side of the membrane.
moves from high density to low density until equal

Front 3

permable

Back 3

All molecules are able to enter and leave the cell.

Front 4

semi-permeable

Back 4

Only certain small molecules can enter and leave the cell.
cell membrane.

Front 5

phospholipid bilayer

Back 5

makes up most of the cell membrane
is semi-permeable

Front 6

phosphate head

Back 6

hydrophylic
makes up the outside and inside layer of the cell membrane

Front 7

fatty acid tail

Back 7

hydrophobic
connects together inside the cell membrane

Front 8

osmosis

Back 8

the process where water molecules diffuse in and out of the cells.
high percent sugar in water outside: water flows out.
low percent sugar in water outside: water flows in.

Front 9

hypertonic

Back 9

there are less molecules outside the cell than inside.
water molecules flow out the cell and the cell shrinks.

Front 10

hypotonic

Back 10

there are more water molecules outside the cell than inside.
water molecules flow into the cell and the cell swells.

Front 11

Isotonic

Back 11

water molecules are equal inside and out of the cell.
water molecules move in and out of the cell at the same rate.

Front 12

equilibrium

Back 12

both sides of the membrane has equal concentration of particles.
no more net movement in one direction.
still has random movement.