THE CELL MEMBRANE A WHOLE WORLD: THE CELL MEMBRANE A WHOLE WORLD

Since we were little, we have been studying one of the most important topics in sience , THE CELL STRUCTURE. In spite of this fact, we dont know too much about the cell membrane. We know its main function; to control what goes out and in of the cell; but we had never been able to look more in depth, to see its components, and its functions. Here you will ejoy learning!!!!!!Have fun and find what you want about the cell manbrane!!!!!!!!!!!!! ENJOY=bg:c=

FLUID MOSAIC MODEL:

The Fluid Mosaic Model, as the structure of the cell membrane is called, with all its components; carbohydrates, cholesterol, proteins, gycoproteins, protein filaments, and finally the phospholipids; its main component.

PHOSPHOLIPIDS: It is the main unit that makes up the cell membrane.

7(Positive Charge)=
The head is attracted to water=Hydrophillic

7(Negative Charge)=
The tail repels water=Hydropobic

Phospholipids spontaneously arange themselves into a double layer called Phospolipid Bilayer , in which:

n The hidrophilic ends from the outer borders.

n The hydropholic tails hide inside the heads.

MEMBRANE NUTRIENTS:

Thousands of proteins are embedded within or attached to the surface of a membrane's phospholipids bylayer. Collectively these proteins:

n Regulate the movement of substances through the membrane.

n Communicate with the enviroment.

There are three major categories of membrane proteins:

1.Transport Proteins:Regulate Movement of substances.

2. Receptor Proteins: Molecules triggers(to cause a device to start functioning) that set off cell responses. Such as relase of hormones or opening of channels proteins.

3.Recognition Protein: To identify cells to the body's immune system.

GLYCOPROTEIN: It is a macromolecule composed of a protein and one or more chains of carbohydrates (sugar). These sugars chains modify proteins structures, permitting them to participate in cell-to-cell communication. Many proteins on cell membranes are glycoproteins.6

CHOLESTEROL:The cholesterol molecule inserts itself in the membrane with the same orientation as the phospholipid molecules. The figure, show phospholipid molecules with a cholesterol molecule inbetween. Note that the polar head of the cholesterol is aligned with the polar head of the phospholipids.

It helps maintain the integrity of the plasma membrane, and plays a role in facilitating cell signaling- meaning the ability of your cells to communicate with each other so you function as a human.Also, cholesterol reduces the permeabilty(the ability of a material to allow the passage of a liquid, such as water through rocks) of the membrane. 6