Chapter 3 - Biological Psychology Biological Psychology 1,...

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Unformatted text preview: Biological Psychology Biological Psychology 1, 3, 5, 6, 12, 13, 14, 16, 17, 18, 21, 23, 25 Biological Psychology Can all human behavior be traced to simple biology? Scientists have begun answering that question by studying human and non- human nervous systems. The Nervous System Neuron- the cells that comprise our nervous system. Four main parts of a neuron…. 1. Dendrites 2. Cell Body 3. Axon 4. Myelin Parts of a Neuron Cell body- contains the nucleus of the cell. Parts of a Neuron Dendrites- branches that receive signals Parts of a Neuron Axon- carries signals to other cells Parts of a Neuron Myelin Sheath- layer of fatty tissue surrounding the axon; increases speed of neural impulses How do Neurons Work? Action Potential- excitation of a constant magnitude that follows the axon to the next neuron Common misconception: neurons do NOT rely on electrical impulses to carry messages. How do Neurons Work? Once the action potential reaches the end of the axon, chemicals are released from the “terminal buttons” these chemicals are taken in by the next neuron. These chemicals are called neurotransmitters and the space they are released into is the synapse. How do Neurons Work? How do Neurons Work? Each neuron has synapses with many other neurons. The neurons that communicate with it can give signals for it to maintain it’s resting potential or initiate it’s action potential. Should I rest or should I start the action potential? REST REST REST FIRE FIRE Neurotransmitters Once the neurotransmitters are released into the synapse one of several things can happen. 1. Re-uptake- neurotransmitter is absorbed back into the terminal button 2. Metabolization – neurotransmitter is absorbed into the body and blood stream 3. Re-excites the post-synaptic neuron, remains in the synapse for a moment longer. 05/11/09 Free Template from www.brainybetty 14 Neurotransmitters controls alertness and arousal Norepinephrine affects mood, hunger, sleep, and arousal Serotonin influences movement, learning, attention, and emotion Dopamine linked to pain control and to pleasure Endorphines triggers muscle contraction Acetylcholine Function Neurotransmitter Parts of the Nervous...
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This note was uploaded on 07/13/2008 for the course PSYC 110 taught by Professor Delanger during the Spring '06 term at University of Tennessee.

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Chapter 3 - Biological Psychology Biological Psychology 1,...

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