Aim: How does the structure of the cell membrane contribute to its function?

What is the function of the structure below?

Functions of the cell Membrane Protection Controls what enters and exits Has Receptors: Allows for cell communication

Receptors By receiving hormones and neurotransmitters RECEPTORS Receptors (proteins in the membrane) allow for cell to cell communication. How? By receiving hormones and neurotransmitters

Cell membrane Structure lipids Proteins

Proteins and Lipids PROTEIN Lipid

Why is this model called the fluid mosaic model? + = Fluid: because the membrane is able to move. Mosaic : because it is made of many pieces http://home.earthlink.net/~shalpine/anim/Life/memb.htm http://home.earthlink.net/~shalpine/anim/Life/memb.htm

How is the cell membrane different from an umbrella? An umbrella is impermeable It does not allow materials through

How is a cell similar to a window screen? The window screen is permeable

How is a window screen similar to the cell membrane? The cell membrane is SEMI-PERMEABLE-it allows certain materials to pass through

What will get through the cell membrane? Things that are small enough to pass across!

What types of materials can pass across? CO2 H20 simple sugars Amino acids

Why can’t starch pass across? They are too big!

Can the elephant get into the house?

Do all things get through the cell membrane? SELECTIVELY PERMEABLE PICKY OR CHOOSEY ABLE TO PASS Only certain materials are able to pass across the membrane!

Why do some things get through the cell membrane? Small molecules are more likely to get through the cell membrane compared to big molecules