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Psch notes - September 28th.docx

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thmidterm is Oct 20 posted a link to a podcast form NPR that discusses a very unethical experiment at Harvard that had unfortunate consequencesthSeptember 29 2010NeuronsTypical estimate you have 100 billion of them is AsymmetricalA nerve cell the basic building block of the nervous systemWhy Different typesSensory neuronsobring sensory information to the central nervous systemInterneuronsoneurons that connect exclusively within the central nervous systemMotor NeuronsoSend signals from the brain and spinal cord to muscles and glandsDendrites the branching processes of a neuron that receives and integrates input from other neurons before passing it on to the cell bodyCell body portion of the neuron concerned with regular cell processesMyelin Sheath a layer of fatty tissue increases transmission speed of neural signals surrounds axonsAxon terminal the site of neurotransmitter releaseAction Potential a neural impulse a brief electrical charge that travels down an axonThe Action Potentialneurons at rest are negative with respect to the fluid outside the cell extracellular space partly through the actions of sodium potassium pumpDuring the action potential sodium rushes into the cell depolarizing the cellShortly after potassium rushes out repolarising the cellStuffSynapses the junction between the axon terminal of one neuron and the dendrite of anotherothe actual space referred to as the synaptic gap or synaptic cleftNeurotransmitter chemical messengers that cross synaptic gaps between neurons they are released by sending cell and bind to receptors on the receiving cellLock and Key modelfigure in book transmission is only in one direction across a synapseDrugs work by mimicking the actions of neurotransmitters and by binding to the receptors Heroin and morphine bind to opiate receptors Compounds in cannabis bind to anandamide receptorsLook at table 21 in bookSome neurotransmitters and their functions acetylcholine Dopamine serotonin norepinephrine nor epinephrine GABA Glutamatefunction vs example of malfunction reuptake the reabsorbtion of a neurotransmitterby the neuron that releases itNervous SystemNervous system the bodys communication network consisting of all the nerve cells of the peripheral and central nervous systemNerves Bundled axons that for neural connections betweek the nervous system and muscles glands and sense organsNervous SystemCentral brain and Peripheralspinal cordSomatic controls Autonomic controls voluntary movements of selfregulated action of skeletal musclesinternal organs and glandsParasympathetic Sympathetic arousingcalmingCentral nervous system the brain and spinal cordPeripheral Nervous System the sensory and motor neurons that connect the central nervous system to the rest of the bodySomatic nervous system the ivision of the peripheral nervous system that controls the bodies skeletal musclesAutonomic nervous system the Prt of the peripheral nervous system that controls the glands and muscles of the internal organs It has two divisions the sympathetic arousing and Parasympathetic calmingSympathetic Nervous SystemArouses the system for action odilates airwayoIncreased heart rateoConstricts blood vesselsoDecreased gastric mobilityoDecreased urine productionoRelease of glucose from liver increased fat hydrolysisoChannels blood away from organs and towards muscle and brainParasympathetic Nervous SystemReturns the body to a restful low energy stateoConstricts airwayoSlows heart rate
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