Psych 1100, Week 3 Notes
Psych 1100, Week 3 Notes PSYC 1100
Popular in General Psychology I
Popular in Psychology (PSYC)
This 3 page Class Notes was uploaded by Sahar on Saturday September 24, 2016. The Class Notes belongs to PSYC 1100 at University of Connecticut taught by Dr. Susan Holt in Fall 2016. Since its upload, it has received 7 views. For similar materials see General Psychology I in Psychology (PSYC) at University of Connecticut.
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Date Created: 09/24/16
Psych Notes Neuron Cell of the nervous system o 3 types: Sensory: takes info from sense organs and brings it into the nervous system Window to the outside world o Motor: takes info from the nervous system and brings it to the muscles and glands o Interneuron: found in the brain and spinal cord and they do central processing. Connect with sensory, motor, or other interneurons 99% of neurons are interneurons o Support cells: Glia cells: support cells for the nervous system Guide neurons to their correct destinations during prenatal development Acts as insulation as it develops myelin Myelin: permits an action potential to be conducted quickly along the neuron’s axon Neurotransmitter: Chemicals released from synapses that activate other neurons o Any excess is reuptaken into the axon terminal Neuron Structure Dendrite: receives information from other neurons Cell body OR Soma: collects and combines incoming information Axon: conducts action potential away from cell body/soma Myelin sheath: fiber along which action potential is generalized Node of Ranvier: gap that permits the fast propagation of an action potential from gap to gap Axon terminal OR Synaptic knob: contains synaptic vessels that pull, then release the neurotransmitter Red arrow shows direction of action potential across the neuron Neuron Function Action ^ Resting Potential: the inside of the neuron is negatively charged compared to the fluid around the neuron (negative charge is 70 millivolts) Graded Potential: can change the excitatory influence to make the charge more positive. If the influence is inhibitory, the charge is more negative At 50 millivolts (threshold), action potential is generated Action Potential: is generated at threshold. The action potential is triggered, and neuron permeability changes, sending Na+ (Sodium) rushing into the Node of Ranvier. Because of this influx of sodium, there is an increase in action potential. o At a certain point, a sodium barrier is put up so no more sodium can enter, and then K+ (Potassium) leaves the cell, decreasing the charge of the cell At negative potential, it is harder to generate potential than it is after a period of rest
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