Presentation is loading. Please wait.

Presentation is loading. Please wait.

Cell Environment Notes p. 394. Selectively permeable Some things can pass through the cell membrane & some cant Some things can pass through the cell.

Similar presentations


Presentation on theme: "Cell Environment Notes p. 394. Selectively permeable Some things can pass through the cell membrane & some cant Some things can pass through the cell."— Presentation transcript:

1 Cell Environment Notes p. 394

2 Selectively permeable Some things can pass through the cell membrane & some cant Some things can pass through the cell membrane & some cant

3 Ways of moving through a cell membrane: 1. Passive transport – no energy needed 2. Active transport – needs energy

4 Diffusion Passive Passive Molecules move from an area of higher concentration to an area of lower concentration Molecules move from an area of higher concentration to an area of lower concentration

5 Why diffusion happens Molecules are always moving Molecules are always moving They bump into each other They bump into each other Causes them to spread out Causes them to spread out

6 Osmosis Diffusion of water Diffusion of water Passive Passive

7 Why cant people drink large amounts of salt water?? Salt water causes water to move out of body cells Salt water causes water to move out of body cells

8 Active Transport Move materials through cell membrane, using cellular energy Move materials through cell membrane, using cellular energy Two types: Two types:

9 1. Transport Proteins Pick up outside molecules & bring them inside Pick up outside molecules & bring them inside Uses energy Uses energy Can move things in or out of cell Can move things in or out of cell

10 2. Engulfing Cell membrane surrounds & engulfs a particle Cell membrane surrounds & engulfs a particle Forms a vacuole with the particle inside Forms a vacuole with the particle inside Uses energy Uses energy

11 Why are cells small? Materials must be able to flow through cytoplasm and reach their destination Materials must be able to flow through cytoplasm and reach their destination Keep travel time low! Keep travel time low! If cell grew too large, it could not function well enough to survive. If cell grew too large, it could not function well enough to survive.


Download ppt "Cell Environment Notes p. 394. Selectively permeable Some things can pass through the cell membrane & some cant Some things can pass through the cell."

Similar presentations


Ads by Google