BIOS 3450 Human Physiology | Plasma Membrane | Vol 1

Channels

Channels

Contain hollow pore that allows passages of ions, water, or small molecules.

Channels can be selective to a particular ion?

True.

Channels can’t be selective to a particular ion?

False.

Carrier (Transport) Proteins

Transport substances across membrane without use of a pore.

Docking-marker acceptors

On inner surface, bind lock and key with docking markers of secretory vesicles.

Are docking-marker receptors peripheral?

Yes.

Membrane Bound enzymes

On inner or outer surface, control specific chemical reactions.

Receptros

Bind with specific chemical signaling molecule that activates the protein.

Cell adhesion melecules

Protrude outside to link with other cells or structures, or inside to link with cytoskeleton

Glycoproteins

Complex of proteins and carbohydrate involved with cell’s ability to recognize similar cells.

True or False: Desmosomes have the strongest junction, plaques on inner surface of either side connected by CAMs, and are found in tissues subject to stretching.

True.

True or False: Tight junctions prevent molecules in ECF larger than H2O to pass between cells.

True.

True or False: Tight junctions prevent molecules in ECF smaller than H2O to pass between cells.

False.

True or False: Tight Junction proteins of neighboring cells directly fuse together.

True.

True or False: Gap Junctions have pores formed by direct linkage of connexons in neighboring cells.

True

True or False: Gap Junctions have pores formed by indirect linkage of connexons in neighboring cells.

False.