Biology - Introduction to General Psychology Psychology I...

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Introduction to General Introduction to General Psychology Psychology
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Glia I. Cells of the Brain Astrocytes Oligodendrocytes, Schwann cells Microglia Radial glia
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Neurons I. Cells of the Brain
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Neurons Dendrites I. Cells of the Brain
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Dendritic spines
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Neurons Soma I. Cells of the Brain
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Neurons Axon Myelin sheath Nodes of Ranvier I. Cells of the Brain
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Neurons Terminal buttons I. Cells of the Brain
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Action potential Neurotransmitters (Excitatory & Inhibitory) postsynaptic potentials I. Cells of the Brain II. Types of neural signals
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Action potential resting (membrane) potential = -70 mV (voltage inside:voltage outside) I. Cells of the Brain II. Types of neural signals
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Action potential resting (membrane) potential = -70 mV (voltage inside:voltage outside) brief reversal of membrane potential = e.g., +50 mV I. Cells of the Brain II. Types of neural signals
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Myelinated axons action potentials only occur at the Nodes of Ranvier saltatory conduction less # of action potentials = signal travels faster down the neuron I. Cells of the Brain II. Types of neural signals
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I. Cells of the Brain II. Types of neural signals Special properties of the action potential “all or none” Threshold of excitation absolute refractory period relative refractory period
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Neurotransmitter release vesicles full of neurotransmitters exocytosis diffusion across fluid-filled synapse I. Cells of the Brain II. Types of neural signals Terminal button of Neuron A Dendrite of Neuron B
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I. Cells of the Brain II. Types of neural signals Ntm. binding with receptors on postsynaptic membrane = opening ion channels = EPSP or IPSP (if membrane is already depolarized) neutralization of EPSP and produces EPSP e.g., structural changes in learning
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(Excitatory or Inhibitory) Postsynaptic potentials Cable properties I. Cells of the Brain II. Types of neural signals Terminal button of Neuron A Dendrite of Neuron B
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Action potential Strength does not degrade over time & distance tad bit slower I. Cells of the Brain II. Types of neural signals (Excitatory or Inhibitory) postsynaptic potential Strength degrades over time & distance quicker than Action Potential
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I. Cells of the Brain II. Types of neural signals All EPSPs & IPSPs are integrated EPSPs > IPSPs = possibly action potential IPSPs > EPSPs = action potential unlikely
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Action potential down axon I. Cells of the Brain II. Types of neural signals
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