Approximately 50% of the choline is returned to the presynaptic terminal by Na+-choline cotransport

TLS Online TPP Program

#Id: 10107

#Unit 4. Cell Communication and Cell Signaling

Focal adhesion

Function- Shape, signaling, force transmission, cell movement

TLS Online TPP Program

#Id: 10108

#Unit 4. Cell Communication and Cell Signaling

Tight junctions seal off body cavities and restrict diffusion of membrane components

TLS Online TPP Program

#Id: 10109

#Unit 4. Cell Communication and Cell Signaling

Tight junctions prevent the diffusion of: 

Macromolecules

Small water-soluble molecules

Ions

Membrane proteins 

Glycolipids

TLS Online TPP Program

#Id: 10110

#Unit 4. Cell Communication and Cell Signaling

Ca2+-dependent cadherin- mediated adhesion also plays an important role in tight-junction formation, stability, and function

TLS Online TPP Program

#Id: 10111

#Unit 4. Cell Communication and Cell Signaling

Gap junctions permit the passage of molecules as large as 1.2 nm in diameter (molecules smaller than 1200 Da).

TLS Online TPP Program

#Id: 10112

#Unit 4. Cell Communication and Cell Signaling

Ions, low-MW precursors of cellular macromolecules, products of intermediary metabolism, & small intracellular signaling molecules can pass from cell to cell through gap junctions.