CELLS - Plasma/Cell Membrane

Plasma/Cell Membrane

Is the outermost component of a cell

that acts as a selective barrier and

forms a boundary between the

material inside and outside, through

which the cell interacts with its

external environment.

Fluid-mosaic Model

the model used to describe cell

membrane structure. The

membrane contains

phospholipids(forms a bilayer),

cholesterol, proteins, and

carbohydrates.

• Polar

• Nonpolar

Phospholipids contains 2 regions:

Phospholipid Structure

A Phospholipid molecule has a

polar head region that is

hydrophilic and a nonpolar tail

region that is hydrophilic

The polar region is exposed to

water around the membrane

The non polar region is facing the

interior of the membrane

● glycogen

● potassium

Enzymes found in Higher

concentrations in the cell?

● sodium

● calcium

● Chloride

Substances found Higher concentrations

outside the cell:

Carrier

- Transports specifc substances

accross membrane by changing

shape. ____ proteins are also

known as transporters

Receptor

Recognizes specific ligand and

alters cell's function in some way

Enzyme

Catalyzes reaction inside or outside

cell, depending on which direction

the active site faces

Linker

Anchors filaments inside and

outside the plasma membrane,

providing structural stability anf

shape for the cell, may also

participate in movement of the cell

or link 2 cells together

Cell Identity Marker (glycopreotein)

Distinguishes your cells from

anyone else's, an important class of

such are the major

histocompatibility proteins