Transcript The Cell in its Environment

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
Passive transport
3. ACTIVE 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)