Cell Movement and Energy Tuesday, March 14, 2017

Moving Cell Material Diffusion – Movement of a substance from an area of high concentration to low concentration Osmosis – diffusion of water only through a membrane Facilitated diffusion – molecules pass through a cell membrane using a transport protein (no energy) Active transport – movement of substance through membrane using energy

Endocytosis – cell takes in a substance by surrounding it with the cell membrane Exocytosis - process in which a cell’s vesicles release their contents outside the cell.

Identifying Processes Name the process involved in moving molecules across the cell membrane in each of the following cases. Write the following words down on a scratch piece of paper LARGELY: Endocytosis Exocytosis Osmosis Diffusion Active Transport Facilitated Diffusion

Fresh water moves into a single-celled organism. Inside cell = 94% water Outside cell = 100% water

Pockets of the cell membrane fill with water and pinch off to become vacuoles inside the cell

Oxygen molecules (O2) move from the lungs into the bloodstream. 100 units of O2 40 units of O2

An amoeba engulfs a large particle of food

Carrier proteins transport glucose into a muscle cell

Sodium ions (Na+) are pumped out of a red blood cell 19 units of Na+ inside of cell 155 units Na+ outside of cell