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UCONN - PNB 2264 - Class Notes - Week 5

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background image 9/14/18 1 Membrane Potential in Neurons Neurons Neurons Are The Basic Unit of The Nervous System: Use changes in membrane potential to send  messages throughout the entire body. Characteristics of Neurons: 1. High Metabolic Rate (Why?) 2. Extreme Longevity 3. Non-mitotic Neuron Cytology Neuronal Structures: 1. Dendrites 2. Cell Body 3. Axon 4. Axon Terminal  
background image 9/14/18 2 Dendrites Branched processes  protruding from the cell  body  Receive signals  (using receptors) Dendrites receive many signals simultaneously (hippocampus) Dendrites There is a lot of variation in dendrites (some neurons have one or  two, others have hundreds!  Cell Body Also known as the soma Contains Organelles: e.g.  Nucleus, Golgi  Specializations: Many Mitochondria
Many Ribosomes
Soma a lotof ribosomes protein synthesis
background image 9/14/18 3 Axons Action Potentials are sent 
through the axon.
Neurons have either one axon or 
no axon at all.
The region where the axon  connects to the cell body is the  axon hillock. Axon Terminal The distal part of the axon. Forms a synapse (connection) with another cell.  Electrical Signals Within Neurons Passive Electrical Signals A transient change in membrane potential that dissipates as it 
propagates in space and time (e.g. a graded/synaptic 
potential)
Active Electrical Signals  A change in membrane potential that is maintained over a long  distance (e.g.  an action potential) 9 where action potential starts

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School: University of Connecticut
Department: Physiology
Course: Human Physiology and Anatomy
Professor: Kristen Kimball
Term: Fall 2018
Tags: anatomy, neurophysiology, and Physiology
Name: PNB 2264, Week 5 Monday Notes
Description: These notes cover the beginning of our learning of Neurophysiology. This is Chapter 8 in our textbook and will be on Exam 2.
Uploaded: 09/23/2018
11 Pages 109 Views 87 Unlocks
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School: University of Connecticut
Department: Physiology
Course: Human Physiology and Anatomy
Professor: Kristen Kimball
Term: Fall 2018
Tags: anatomy, neurophysiology, and Physiology
Name: PNB 2264, Week 5 Monday Notes
Description: These notes cover the beginning of our learning of Neurophysiology. This is Chapter 8 in our textbook and will be on Exam 2.
Uploaded: 09/23/2018