Ch. 2 - Chapter Two The Biology of Behavior True or False?...

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Chapter Two The Biology of Behavior
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True or False? We only use 10% of our brains. - false Women are more “right brained” whereas men are more “left brained.” - false Marijuana kills brain cells. - False- actually protects brain cells
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Where is the “Seat” of the Mind? Cardiac Hypothesis - Empedocles, Aristotle, Religions (?) E Heart is center of mind Brain Hypothesis Brain, cognitive side - Alcmaeon - Hippocrates - Galen Gladiators
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Brain Cells The Neuron Hypothesis - Holds that the neuron is the functional unit of the brain, and therefore of mental events Neurons: 100 billion (bigger than glia) Glia: 1 trillion (smaller than neurons) - Myelin (fatty substance- helps brain cells communicate) - Other Support Roles
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Key Parts of the Neuron (meeks diagram) Dendrites - Receive signals from other neurons Cell Body (Soma) C - DNA Axon - Sends signal toward other neurons Myelination (look up) Myelin sheath terminal
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Key Parts of the Neuron Axon Hillock - Where the action potential is created Myelinated Segments - Speed Up Action Potentials Nodes of Ranvier - Reinstate the full strength of the action potential - (don’t really need to know)
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Key Parts of the Neuron Axon Terminal - Releasing the neurotransmitter into the synapse in order to affect the next neuron in line
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A Neuron Is Electrical. Based on Ionic Charges (Think: Battery) B - The Positive Excitatory input into a neuron involves allowing + charged ions like sodium (Na+) into the cell. Makes cell more likely to “fire” E.G. Nicotine - The Negative Inhibitory input into a neuron involves allowing – charged ions like chloride (Cl-) into the cell. Makes cell less likely to fire
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This note was uploaded on 03/22/2010 for the course PSYC 1101 taught by Professor Crystal during the Spring '08 term at University of Georgia Athens.

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Ch. 2 - Chapter Two The Biology of Behavior True or False?...

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