The Cell in its Environment. The Cell Membrane stars in:. The Gatekeeper. 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.
The Cell Membrane stars in:
= 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. ACTIVE TRANSPORT
= the movement of materials across the membrane WITHOUT Energy
Let’s learn about the methods of PASSIVE transport……..
Process where molecules in high conc. will move to areas of low conc.
Neato fact: osmosis is what makes fresh and salt water fish so different…
= the movement of materials through a membrane USING energy
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)