BIOL 225 Lecture Notes - Lecture 8: Gap Junction, Electrical Synapse, Axon Hillock
24 Apr 2016
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Class notes contd action potential: all or nothing phenomena either have one or you don"t frequency of action potentials may reflect the strength of signal each ap lasts a few millisecond is it followed by a short refractory period. Rp: when the na gates are inactivated for a few milliseconds preventing the initiation of further or action potentials graded potential. 2- na+ diffuses into neurone inside of neurone become less negative. 4- na+ gates unlock and ready for action again. 2- na+ diffuses into neuwon (reenforced by charge as well) 4- k+ diffuses out of neruoron inside of neurone becomes negatively charges again. Glial cells (glia) nourish neurons (glucose) regulate extracellular fluids surrounding the neurone insulate axons. When an axon is covered by schwann cells, it is covered by myelin sheet/ myelinated neurone. Temperal summation ^ (coming over time) spacial summation c and d- (different neurons at the same time) neurotransmitter. Reabsorbed by pre synaptic neuron or broken down.
