PSY100s-biological11 - lecture 3

PSY100s-biological11 - lecture 3 - Introduction to...

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Introduction to Psychology The Biology of Behaviour
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Plan for Today Results of class experiment Biological bases of behavior Communication in the nervous system Organization of the nervous system Researching the brain
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Manipulation Check Anxiety Scale N Mean Std. Dev. F signific ance Control 20 35.15 7.842 8.44 .01 Anxi- ous 20 49.95 12.263 Total 40 42.15 13.512
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Dependent Measure N Mean Std. Dev. F signific ance Control 20 7.65 2.259 5.19 .01 Anx- ious 20 4.85 2.267 Total 40 6.25 2.334
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Components of the Neuron Dendrites: receive information from other neurons Cell body: creates transmitter molecules Axon Myelin insulates the nerve cell, speeds up conduction of nerve messages Terminal buttons of the axon release transmitter
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Neuron Resting Potentials The membrane of the neuron separates charges The ions NA + and Cl - are found outside the membrane, whereas the ion K + is mostly inside the membrane The membrane is slightly permeable to K + ions, so that at rest, the inside is about -70 millivolts relative to the outside At rest, few NA + ions are able to cross the membrane NA + K + Cl - Cross-section of nerve cell showing distribution of ions across the membrane INSIDE
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Graded Potentials Stimulation of the nerve membrane can open ion channels in the membrane NA + ions flowing in will depolarize the membrane (movement from -70 mV to say -60 mV K + ions flowing out of membrane will hyperpolarize the membrane (-70 mV to say -90 mV)
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PSY100s-biological11 - lecture 3 - Introduction to...

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