UGA BIOL 1108 - Electrical Signals 3 (10 pages)

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Electrical Signals 3



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Electrical Signals 3

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Pages:
10
School:
University of Georgia
Course:
Biol 1108 - Principles Bio Ii

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10 14 14 Electrical Signals Ac on Poten al Propaga on Lesson 23 BIOL 1108 15 October 2014 1 Unit Animal Form and Func on Today s Topic Ac on Poten al Propaga on Today s learning objec ves Be able to describe how an electrical signal moves down an axon from one neuron to the next apply what you ve learned to real world situa ons 2 1 10 14 14 Figure 48 11 5 Key Na K 4 Falling phase of the action potential 3 Rising phase of the action potential Membrane potential mV 50 OUTSIDE OF CELL 100 Sodium channel Potassium channel 3 0 50 2 Depolarization Action potential Threshold 2 1 4 5 1 Resting potential Time INSIDE OF CELL Inactivation loop 1 Resting state 5 Undershoot 3 Channels in the cell membrane of an axon 4 2 10 14 14 t t 5 Ac on Poten al Propaga on Speed 1 2 6 3 10 14 14 Ac on Poten al Propaga on Speed Size and Structure Myelina1on Type Giant Squid Unmyelinated Mammals Unmyelinated Axon Diameter Up to 1 mm 2 m Mammals Myelinated 5 m Mammals Myelinated 20 m Speed Example 100m Propulsion sec 2m sec Warm temperature sensors 40m Pain mechano sec receptors 120m sec In 2m Tall Person NA Toe to brain in 1 sec Toe to brain in 50 ms Motorneurons Brain to to muscle toe in 16 ms 7 Channels in the cell membrane of an axon 8 4 10 14 14 Ac on Poten al Propaga on Speed Structure 9 In a neuron signal transmission speed is a ected MOST by which structure a dendrites b axon hillock c axon size d myelin sheath D SQUID drawing credit dolphin4life weebly com 10 5 10 14 14 Figure 48 4 Signal Movement Between Neurons Dendrites Stimulus Axon hillock Nucleus 1 synapses Cell body Presynaptic cell Signal direction Synapse Axon 2 synapses Synaptic terminals Synaptic terminals Postsynaptic cell Neurotransmitter 11 Figure 48 15 Presynaptic cell Neuron to Neuron Postsynaptic cell Axon Synaptic vesicle containing neurotransmitter 1 Communica on for Chemical Synapses Postsynaptic membrane Synaptic cleft Presynaptic membrane 3 K Ca2 2 Voltage gated Ca2 channel Ligand gated ion channels 4 Na 12 6 10



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