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Lecture 4

Psych1010 Lecture 4 Notes.docx

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York University
PSYC 1010
Heather Jenkins

September 19, 2013 Psych1010- Lecture 4 Slide 1: Neurons  Neurons: the conducting cells of the nervous system  Communicate via electrical or chemical Slide 2: Glial Cells  Support, nourish, protect  Surround neurons and hold them in place  Manufacture nutrient chemicals neurons need  Absorbs toxins and waste materials from the neurons Slide 3: Meylin Sheath  fatty insulated layer derived from glial cells  insulates axon from electrical activity  acts to increase rate of transmission of signals  gaps (nodes of Ranvier) exist in myelin sheath along axon Slide 4: Action Potential  a neuron impulse that travels down an axon like a wave  the neuron receives signals from other neurons; some are telling it to fire and some telling it not to fire  when the threshold is reached the action potential starts moving  like a gun, it either fires or it doesn’t more stimulation does nothing  this is known as the “all or none” response  the threshold is reached when excitatory signals outweigh the inhibitory signals by a certain amount Slide 5: The Synapse  is a “junction” between the axon tip of the sending neuron and the dendrite or cell body of the receiving neuron Slide 6: Neurotransmitters  are chemicals used to send siganlas across the synaptic gap Slide 7: Effect of Neurotransmitter  Excitatory Neurontransmitters (FIRE!!!)  Inhibitory Neurotransmitter (DON’T FIRE!!!) September 19, 2013 Slide 8: Recycling Neurotransmitters  Reuptake: after neurotransmitters stimulate the receptors on the receiving neuron, the chemicals are taken back up to the sending neuron to be used again OR  Breakdown: after neurotransmitters stimulate the receptors on the receiving neuron, other chemicals in the synapse break down neurotransmitters into its chemical components Slide 9: Specialized Transmitters  Ach o Control of behavior, l
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