Lec 7-9 Biological - Chapter 3 Biological Aspects of Psychology 1 Biological Psychology • Study of the cells/organs of the body& the physical

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Unformatted text preview: Chapter 3: Biological Aspects of Psychology 1 Biological Psychology • Study of the cells/organs of the body & the physical and chemical changes involved in behavior and mental processes • The function of the nervous system • Reductionism : The Neuron • Moving up : Organization of the Nervous System The Plan • Billions of cells – Brain – Spinal Cord – Other Nerve Fibers • Processes info – Interprets, makes decisions, guides actions Nervous System Three Main Functions The Plan • The function of the nervous system • Reductionism : The Neuron • Moving up : Organization of the Nervous System Cells of the Nervous System • 2 major types – Neurons • rapidly respond to and send signals – like highways – Glial Cells • hold neurons together • help neurons communicate – glial means “glue” • Cleans up the mess What’s in a Neuron? • Similar to other cells – Outer membrane • semipermeable – Cell body • Nucleus • Mitochondria • But…. • Specialized features for communication – Axons – Myelin – Dendrites – Synapses What’s in a Neuron? What’s in a Neuron? • Fibers that carry signals a way from the cell body Axons Myelin • Fatty substance covering some axons that speeds up communication – glial cells 12 Dendrites • Fibers that receive signals from axons and carry them to the cell body How do cells communicate Action Potential : A sudden wave of electrochemical change in the axon Synapse • Gap between neurons – Signals transferred across gap via neurotransmitters (chemicals) Synapses • Most common way info is transmitted between cells • Small gap between end of axon and another cell’s dendrites Synapses • Action Potential reaches end of the axon of presynaptic cell • When AP gets to vesicles, they fuse to membrane • Its neurotransmitters are released into synapse See Animations The Neuron: Who’s Who? AP AP I’m pre-synaptic! I’m post-synaptic! Nothing here but a synapse… Synapses • Neurotransmitters move across the synapse • Bind to receptors on postsynaptic cell – Receptor sites are neurotransmitter specific 19 How do cells communicate Action Potential : A sudden wave of electrochemical change in the axon Action Potentials • Cells are usually polarized : – More negative inside + + +----- Channels...
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This note was uploaded on 03/10/2011 for the course PSYCH 100 taught by Professor Suarez during the Spring '09 term at University of Illinois, Urbana Champaign.

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Lec 7-9 Biological - Chapter 3 Biological Aspects of Psychology 1 Biological Psychology • Study of the cells/organs of the body& the physical

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