psyc1101_aug311

psyc1101_aug311 - Reviewed biological parts related to...

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August 31, 2007 Reviewed biological parts related to psychology (from Wednesday's lecture). Cells in the nervous system are divided into two groups: glia & neurons. Neurons are cells within the nervous system that process information. Types of neurons Afferent neurons : carry messages to the central nervous system (spinal cord or brain) from sensory organs. Efferent neurons : carry messages to the muscles and glands from the central nervous system. Interneurons (association neurons): carry messages from one neuron to another Neurons at rest Discoveries of Hodgkin & Huxley : Used a giant squid attached to electrodes- found fluids inside and outside of neurons that contained electrical charges (ions) . At rest, a neuron has a negative charge of -70 millivolts. Action potential of neurons Stimulation causes cell membrane to open up for a short amount of time. Sodium ions that are positively charges (Na+) flow into the neuron because they are attracted to the neuron's negative charge. Action potential: shift in electrical charge that travels along the neuron . (For example, think: spark traveling on trail of gasoline) “firing of the neuron” “all or none” law - any activation will cause it to fire and it either fires, or it doesn't.
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