Ch4_ppt_-_Brain_and_Behavior_Compatibility_Mode_

They release chemicals that allow them to communicate

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Unformatted text preview: chasing novaPDF printer (http://www.novapdf.com) 10/28/2009 Neurons do 2 important things: They generate electricity that creates nerve impulses 2. They release chemicals that allow them to communicate They with with other neurons and with muscles & glands 1. The Electrical Activity of Neurons Extracellular Fluid (salty) Cl‫־‬ Cl‫־‬ (Semi-permeable Cell membrane) 17 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 10/28/2009 The Electrical Activity of Neurons Resting potential Polarization State Action Potential 18 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 10/28/2009 Action Potential (Na channels open) Action Potential 19 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 10/28/2009 Action Action Potential ((K channels open) K Action Potential 20 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 10/28/2009 Action Potential Action Action Potential Membrane M embrane is not excitable & cannot discharge another impulse 21 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 10/28/2009 Action Potential The The Stimulated Neuron Axon Action potential travels down the axon 22 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 10/28/2009 The Stimulated Neuron 1. 2. 3. 4. 5. 6. Resting potential Action Potential (nerve impulses) Depolarization Repolarization Hyperpolarization Absolute Refractory Period All-or-None Law: action potentials occur at uniform & action max max intensity OR not at all Graded Potentials: changes in negative resting potential that don’t reach +50mV threshold (can add up by several neurons neurons to reach action potential in postsynaptic neuron How How Neurons Communicate: Synaptic Synaptic Transmission Synaptic Space (gap between axon terminal & dendrite of (gap receiving receiving neuron) Neurotransmitters Neurotransmitters (chemical substances carrying messages to other other neurons, muscles, or glands) 5 steps: 23 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 10/28/2009 1. Synthesis of Neurotransmitter: transmitter molecules are formed inside neuron 2. Storage in Synaptic vesicles: (chambers within axon terminals) 24 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 10/28/2009 3. Release into synaptic space: from from presynaptic presynaptic to postsynaptic neuron in fluid-filled space 4. Binding to receptor sites: (large (large protein molecules molecules embedded in receiving neuron’s cell membrane) 25 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 10/28/2009 2 chemical reactions on chemical postsynaptic postsynaptic neuron 1. Excitatory neurotransmitter Excitatory neurotransmitter Na+ channels open, flood into cell, channels depolarize it Action Potential 2. Inhibitory neurotransmitter Inhibitory neurotransmitter K+ flow out or CL‫ ־‬flow in from flow exterior ↑negat...
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This document was uploaded on 01/15/2014.

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