The Cell in its Environment The Cell Membrane stars in:

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Presentation transcript:

The Cell in its Environment The Cell Membrane stars in:

What we ALREADY know: Cell membrane is found around the outside of an animal cell and it is the second layer of a plant cell The job of a cell membrane is to let “things” in and out of the cell

What we will soon KNOW: The Cell Membrane welcomes needed materials in 3 different ways… The Cell Membrane disposes of unneeded materials inside the cell by sending them out in 3 different ways…

Selectively Permeable: = some materials can pass through an object while others cannot Permeable= “to pass though” in Latin 1. Usually permeable to oxygen, water and carbon dioxide 2. Unlikely permeable to large objects and salts

3 Methods of Moving in and out of the Cell: 1. DIFFUSION 2. OSMOSIS 3. ACTIVE TRANSPORT Passive transport

A. PASSIVE TRANSPORT: = the movement of materials across the membrane WITHOUT Energy Let’s learn about the methods of PASSIVE transport……..

What will happen?!?

1. Diffusion: Process where molecules in high conc. will move to areas of low conc.

QUIZ!!!

2. Osmosis: Diff. of H2O Neato fact: osmosis is what makes fresh and salt water fish so different…

B. ACTIVE TRANSPORT!!! = the movement of materials through a membrane USING energy

1. Gross… it did what?!?! Endocytosis!!! = 1) the cell membrane surrounds or engulfs a particle and then 2) it will pinch off to form a vacuole around it in the cell (this still uses E)

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