PHGY 209 Chapter Notes - Chapter 6: Signal Transduction, Adrenal Medulla, Conformational Change
21 Nov 2016
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Contains nucleus and ribosomes, has genetic information for protein synthesis. Series highly branched outgrows (increases cell"s surface area) Aka nerve fiber, extension from cell body that varies greatly in length. Region of axon that arises from cell body. Branches on the axon, near ends, can undergo further branching. Greater branching = greater sphere of influence of cell. Release neurotransmitter (diffuses across extracellular gap to next cell) Bulging areas in axon from which some neurons release chemical messengers. Sheaths covering axon, multiple layers of specialized plasma membrane. Speed up conduction of electrical signals along axon (conserve e) Type glial cells, form myelin sheath of cns axons. Each of tem can branch from myelin on as many as 40 axons. In pns, glial cell that forms myelin sheets segments at regular intervals. Icf & ecf good conductors since contained dissolved ions: lipids cannot conduct current so lipid layer on regions plasma membrane lead to high resistance.
