Lecture 3 - Lecture #3 Chapter 2 Neuroscience and Behavior...

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Lecture #3 Chapter 2 Neuroscience and Behavior -Basic premise: everything psychological is simultaneously biological -Behavior, thought, mood, etc. .. is the product of activity among billions and billions of interconnected cells called neurons. ___________ myelin sheath terminal branches of axon __________| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| /-------------< __________|cell body |_____axon _ ______________________-----------------< __________|___________|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\__________ dendrites ->->neural impulses->-> -How do neurons communicate? -Each neuron contains: -a cell body -two types of branching fibers -dendrites: receive messages from other cells and pass it to the cell body -short bushes of fiber -axon: passes neural message (information) from the cell body and passes it to the other neurons, muscles or glands -can be short or long (e.g. short in brain, long in leg) -extensions of the neuron -usually end in terminal branch -many axons are covered in a fatty substance, called myelin (the myelin sheath) -increases speed of neural message traveling along the axon (neural conduction) -as you get older, you get more and more myelin -cells with no myelin = gray matter, cells with myelin = white matter -Multiple Sclerosis - decay of the myelin - causes lots of problems: loss of motor and mental abilities How do neurons work? - the neuron fires a brief electrical impulse when stimulated by heat, light, sound,
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Lecture 3 - Lecture #3 Chapter 2 Neuroscience and Behavior...

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