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“Cell Environment” Notes

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Presentation on theme: "“Cell Environment” Notes"— Presentation transcript:

1 “Cell Environment” Notes
p. 394 “Cell Environment” Notes

2 Selectively permeable
Some things can pass through the cell membrane & some can’t

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

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

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

6 Osmosis Diffusion of water Passive

7 Why can’t people drink large amounts of salt water??
Salt water causes water to move out of body cells

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

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

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

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

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