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L9 cell communication in the nervous system

L9 cell communication in the nervous system - Lecture 9 Ch...

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Lecture 9: Ch 43 Lecture Notes Cell Communication in the Nervous System I. Overview: a. The nervous system has three overlapping functions: i. sensory input ii. integration iii. motor output I. The vertebrate nervous system b. Organization: i. Central nervous system (CNS): brain and spinal cord ii. Peripheral nervous system (PNS) is everything outside the CNS, transmits information to and from the CNS and regulates the internal environment of the organism. 1
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Lecture 9: Ch 43 Lecture Notes II. How the nervous system communicates c. The neuron Most neurons have the same three parts: 1- Dendrites : collects electrical signals 2- Cell body : integrates incoming signals and generates outgoing signal to the axon 3-Axon : passes electrical signals to dendrites of another cell or to an effector cell. 2
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Lecture 9: Ch 43 Lecture Notes IV. Action Potentials: nerve impulses c. Voltage-gated ion channels i. Resting state ii. Threshold iii. Depolarization phase iv. Repolarization phase v. Undershoot d. All-or-none response e.
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