N5 1.2 Transport Across Membranes Flashcards

Front

Components of cell membranes

Back

Front

Membrane proteins

Back

Front

Selectively permeable

Back

cell membrane controls the size of molecules that can pass through

Front

Concentration Gradient

Back

The difference in concentration between two solutions or cells

Front

Passive transport

Back

The movement of molecules from a region of higher concentration to a region of lower concentration.

Requires NO energy.

e.g. Diffusion & Osmosis

Front

Diffusion

Back

The movement of molecules down a concentration gradient from an area of higher concentration to an area of lower concentration.

Example of Passive transport as it requires no energy. 

Front

Examples of substances that enter animal cells by diffusion are

Back

Glucose and Oxygen

(which are required for respiration)

Front

Example of a substance that leaves animal cells by diffusion is

Back

Carbon dioxide (waste product of respiration)

Front

Osmosis

Back

The movement of water molecules from a higher to a lower water concentration through a selectively permeable membrane.

Example of Passive transport as it requires no energy. 

Front

Animal cells bursting

Back