Proteins, Carbs and Cell to Cell Adhesions

Integral - Polar and Nonpolar Regions
Surface - Anchored in the membrane, keeps them attached to the exterior and interior surface.
Channels and Carrier Molecules - Moving molecules in and out of the membrane, safe passage.
Receptors - Signaling molecules triggering a signal from outside to inside.
Enzymes

Cell adhesion molecules, important in forming tissue
General structure less specialized

Markers for tissues, cells any endemic molecule contain to prevent removal. Used in immune system.

Found exclusively in exterior surface facing out of membrane
Outer surface of plasma membrane
Used in cell recognition, recognizes "self"

Binds cells into tissue/organs

Excellular matrix is a meshwork of fibrous proteins that holds cells together.

Adhering junctions used in tissues subject to stretching.

Seals off passageway between 2 cells in direct contact.

Connects cytoplasm of adjaecent cells to allow for connection.