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Chapter 3

Psy100h1 Textbook notes chapter3 part1

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University of Toronto St. George

CHAPTER 3Genetic and Biological FoundationsP87Nervous systemA communication network comprised of billions of specialized cells evaluates info from the external world then produces behaviours or makes bodily adjustments to adapt to the environmentNeuronThe basic unit of the nervous systemCells that specialize in communicationOperate through electrical impulses and communicate with other neurons through chemical signalsThey differ from most other cells because they are excitableHave 3 functions oReception take in info from neighboring neuronsoConduction integrate those signalsoTransmission pass signals to other neuronsCome in a wide assortment of shapes and sizes but typically share 4 structural regions that assist theneurons communication functions1Dendrites branchlike extensions of the neuron that detect info from other neurons2Cell body in the neuron where info from thousands of other neurons is collected and processed3Axon a long narrow outgrowth of a neuron by which info is transmitted to other neurons 4Terminal buttons small nodules at the end of axons that release chemical signals from the neuron to an area called synapseSynapse the site for chemical communication between neuronsLipids double layer of fatty molecules of the membrane the boundary of a neuron Membraneinvolved in communication between neurons by regulating theconcentration of electrically charged molecules that are the basis of the neurons electrical activityA neuron messages are received by the dendrites processed in the cell body transmitted along the axon and sent to other neurons via chemical substances released from the terminal b
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