Bio Basis(1)

Bio Basis(1) - Chapter 3: The Biological Bases of Behavior...

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Chapter 3: The Biological Bases of Behavior
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Communication in the Nervous System Hardware Glia structural support and insulation memory formation chronic pain psychological disorders Neurons – communication Soma – cell body Dendrites – receive Axon – transmit away
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Figure 3.1 Structure of the neuron
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Neural Communication: Insulation and Information Transfer Myelin sheath – speeds up transmission Terminal button – end of axon; secretes neurotransmitters Neurotransmitters – chemical messengers Synapse – point at which neurons interconnect
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The Neural Impulse: Electrochemical Beginnings Hodgkin & Huxley (1952) - giant squid Fluids inside and outside neuron Electrically charged particles (ions) Neuron at rest – negative charge on inside compared to outside -70 millivolts – resting potential
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The Neural Impulse: The Action Potential Stimulation causes cell membrane to open briefly Positively charged sodium ions flow in Shift in electrical charge travels along neuron The Action Potential All – or – none law
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Figure 3.2 The neural impulse
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The Synapse: Chemicals as Signal Couriers Synaptic cleft Presynaptic neuron Synaptic vesicles Neurotransmitters Postsynaptic neuron Receptor sites
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Figure 3.3 The synapse
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When a Neurotransmitter Binds: The Postsynaptic Potential Voltage change at receptor site – postsynaptic potential (PSP) Not all-or-none Changes the probability of the postsynaptic neuron firing Positive voltage shift – excitatory PSP Negative voltage shift – inhibitory PSP
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Figure 3.4 Overview of synaptic transmission
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This note was uploaded on 11/10/2011 for the course PSY 101 taught by Professor Dan during the Fall '08 term at SUNY Buffalo.

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Bio Basis(1) - Chapter 3: The Biological Bases of Behavior...

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