CSB332H1 Study Guide - Comprehensive Final Exam Guide - Neuron, Wireless Access Point, Protein
19 Nov 2018
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Document Summary
Cumulative effects of stress: acutely (hours), low to moderate physiological levels of adrenal steroids enhance synaptic function and certain types of memory, chronically (days-weeks), high levels of corticosterone mediate adaptive plasticity involving: Spine synapse turnover, dendritic shrinkage: adult brains are continuously producing new neurons at the level of the dentate gyrus. With chronic stress, levels of neurogenesis decrease dramatically: an individual with chronic stress is more vulnerable if they experience a sudden insult (seizure, stroke, head trauma); such as irreversible hippocampal damage. Electrical signaling: neurons encode information by the flow of ions into and out of neurons which is a form of electrical signaling, flow of ions (carrying a charge) that cause on/off signals on neurons. Ions are separated by the cell membrane: ions are only capable of passing the cell membrane when ion channels are opened. Passage of ions generate an electrical signal or electron current that can be recorded using electrophysiology.
