Neuroscience MW - N euroscience & Behavior Why...

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Neuroscience & Behavior Why Neuroscience? Everything psychological is simultaneously biological Nervous system is composed of billions of cells that allow organism to gain info 1._Input______________2. ____Processing___________3. __Output_____________ Basic unit of communication Neurons - Specialized cells that send and receive information about a situation Glial cells - Support for the neurons o growth o protection o restoration Types of neurons Sensory neurons - send info from tissues and sensory organs to the brain Motor neurons - Interneurons - help with communication between sensory and motor neurons Neuron - elementary unit of the nervous system (building blocks)
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Cell Body - the powerhouse of the neuron, where nucleus can be found Dendrite - branches like things that come out of the cell body, where info is received from near by neurons Axon - carries info from neuron to the other neurons Myelin Sheath - fatty tissue the insulates the axon to speed up the travel of info along the axon o Not present in all neurons Axon Terminals - Way info is sent out to near by neurons - has synaptic vesicles that hold chemical messengers – (neurotransmitters) Communication Within the Neuron Neuron At Rest - there are electrically charged atoms (ions) inside and outside of a neutron - at rest, the inside of the cell is slightly more negative than outside the neuron (-70 millivolts) o Resting Potential when the above is the case The membrane is semi permeable How does it send signals? Some background info… Semi permeable membrane - Some molecules pass through, but other cant come through - while at rest, there is more sodium out of the cell and potassium in the cell and to change rest, you need this balance to change Depolarization - positive ions rush inside the axon and cause imbalance of charges
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Once the neuron is excited enough (+30 mv), threshold is reached. Action Potential – the allowinf of the sodium in and potassium out to get a +30 millivolt change in the axon - when MESSAGE IS transmitted through an electrical impulse, down the axon o All-or-none response Either the neuron fires or it doesnt Absolute Refractory Period Reset – so another action potential can take place, until this happens nothing else can happen in that axon… sodium rushes out and potassium rushes back in Communication Between Neurons - Chemical Chemical Synaptic Transmission
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This note was uploaded on 11/28/2010 for the course PSYCHOLGOY 100 taught by Professor Currence during the Winter '09 term at Ohio State.

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Neuroscience MW - N euroscience & Behavior Why...

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