PHYSIOL 201 Chapter Notes - Chapter 2: Axon Hillock, Central Nervous System, Axon Terminal
30 Jan 2019
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Pre-lecture #2: neurons & excitable cells (chapter 6, pages 137-140, 141, 149, 158) Excitable cells are cells that are capable of generating action potentials. Neurons are a type of cell within the central and peripheral nervous systems (cns and. Cell body: location of nucleus and cell organelles. Membrane has ligand-gated ion channels that can open or close to alter membrane potential. Cell body membrane can therefore receive information via binding of chemical messengers. Dendrites: extensions of the membrane of the cell body. Dendrite membranes contain ligand-gated ion channels that can open and close to alter membrane potential. Dendrite membranes can therefore receive information via the binding of chemical messengers. Dendrites increase surface area available to receive information. Axon: long process extending from the cell body. Axon membrane contains voltage gated ion channels and can generate action potentials (aps). First region of the axon is called the initial segment or the axon hillock.
