Biology( Movement In And Out Of Cells)

Front 1

Diffusion

Back 1

is the nest movement of molecules and ions from a region of high concentrations to a region of low concentration down a concentration gradient, as a result of random movement.

Front 2

Osmosis

Back 2

the net movement ofwater molecules from a region of higher waterpotential (dilute solution) to a region of lowerwater potential (concentrated solution), througha partially permeable membrane

Front 3

Osmosis expiriment

Back 3

putting potatoe cylinders in different concentrations

the ones in a higher concentration gained mass

Front 4

Importance of water potential in plants

Back 4

-plants are supported by the pressureof water inside the cells pressing outwards onthe cell wall

- a vacuole pushing out on the wall is said to be turgid, the vacuole is exerting turgor pressure

- if the vacuole loses water the cell will lose turgor and become flaccid

Front 5

Importance of water potential in animals

Back 5

- animal cells don't have cell walls therefore if there is a very high water potential in the cells they may burst

- when the plasma becomes more concentrated because of dehydration the water will be drawn from the red cells by osmosis. they become plasmolysed.

Front 6

Percentage change in mass

Back 6

change in mass/mass at start x100

Front 7

Active transport

Back 7

- the movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration using energy from respiration

Front 8

Importance of active transport

Back 8

- epithelial cells in the small intestine for absorbing glucose

- same in the kidney tubules for the reabsorption of glucose molecules into the bloodsteam