chapter 6 notes

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20 Jun 2011
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Chapter 6- Communication, Integration, and Homeostasis
Cell to Cell Communication
-4 basic methods of cell to cell communication
o1) gap junction- allow direct cytoplasmic transfer or electrical and chemical
signals between adjacent cells
o2) contact dependant signals- occur when surface molecules on one cell
membrane bind to surface molecules on another cell’s membrane
o3) local communication; chemicals that diffuse through ECF
o4) long distance communication- combination of electrical signals carried by
nerve cells and chemical signals transported in the blood
-Gap junctions create cytoplasmic bridges
oGap junctions form from the union of membrane spanning proteins called
connexins on two adjacent cells (the united connexins create a protein channel or
connexion which can open and close)
oWhen channel is open the connected cells function like a single cell that contains
multiple nuclei
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