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Lecture 3

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University of Toronto St. George
Michael Inzlicht

Chapter 3 Summary: Many of the genes in the human genome direct the development and ongoing functions of the nervous system: o A communication network that serves as the foundation for all psychological activity. Neuron: the basic unit of the nervous system that operates through electrical impulses, which communicate with other neurons through chemical signals. o Three functions: Take in the information from neighbouring neurons (reception), integrate those signals (conductions), and pass signals to other neurons (transmission). Dendrites: First region- branchlike extensions of the neuron that detect information from other neurons. Receive information from other neurons and transmit towards the cell body. Information flows through a neuron from the dendrites to the axon terminals. Cell Body: Second region- in the neuron where information from thousands of other neurons is collected and processed. Keeps the neuron alive. The DNA in the neuron tells the neuron what to do. Whether to fire or not. Axon: Third region- a long narrow outgrowth of a neuron by which information is transmitted to other neurons. Terminal Buttons: Small nodules at the ends of axons that release chemical signals from the neuron to an area called the synapse Receives the action potential
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