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Lecture 4

Lecture 4 Notes.docx

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PSYC 1010
Gerry Goldberg

Lecture 4 Notes Aside: Healthy student Initiative: The Biological Basis of Behavior Communications become comprehendible when they are in a form of a pattern. For example, when someone is talking their voice makes vibrations. Each vibration by itself may provide little information but all the vibrations together from meaningful patterns of the information. So it is with the nervous system. Types of Cells within the Nervous system - Nervous system handles information Nervous tissue consists of two types of cells: Glia Cells: provides structural support and insulation for neurons Neurons: Individual cells in the nervous system that receive, integrate, and transmit information Most neurons communicate among themselves but a small minority receives signals from outside . The structure of the nervous system Dendrites: send information to the soma. Some dendrites stimulate the soma to fire and some try to do the opposite. Axon – sends information (electrical impulse) away from soma onto other neurons The Neural Impulse Neuron is ready to release a electrochemical reaction (at rest is like a tiny battery) Resting Potential: A stable, negative charge when the cell is inactive Action Potential: a very brief shift in a neurons’ electrical charge that travels along an axon. Absolute refractory period: the minimum length of time after an action potential during which another action potential cannot begin All-or-none law Cell-Cell Communication The Synapse: space between two neurons Synaptic cleft: singals have to jump this gap Neurotransmitters: travel from synaptic vesicles (within the buttons) to receptor sites “tuned” to recognize and respond to specific neurotransmitter. When this happens can lead to a postsynaptic potential (PSP): a voltage change on a postsynaptic cell membrane This is NOT all-or-none but is graded and increases or decreases the PROBABILITY of a neural impulse in the receiving cell. Two kinds of
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