PSY100H1 Lecture Notes - Autonomic Nervous System, Peripheral Nervous System, Neurotransmitter Receptor
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PSY100H1 Full Course Notes
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Document Summary
Nature (genes) and nurture (social context) interact to affect human behavior. The nervous system is the body"s electrochemical communication circuitry (50 million nerve cells: cns central nervous system, pns peripheral nervous system. Somatic nervous (outside: -autonomic nervous (inside, -sympathetic, -parasympathetic. 3 basic type of neurons: sensory neurons (afferent: from, motor neurons (efferent, (same) sensory afferent motor efferent. Neuron structure: dendrites: get messages from other neurons surrounding it, cell body: take all the information and find out what to do with this information, axon: transport, terminal buttons: pass chemical signal to synapse. They receive from all neurons and send to many other neurons. Excitatory signal: increase the likelihood that the neuron will fire. Inhibitory signals: decrease the likelihood that the neurons will fire. These are determine by polarization of the cell. All or none principle: a neuron fires with the same potency each time (it either fires or does not fire); but how frequently the neurons fires can vary.
