PSY 220 Lecture 2: Propagation
30 Jan 2019
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Document Summary
Between the nodes of ranvier, the depolarization travels by local (passive) current spread . Without crossing the membrane, the ions move from depolarized area to a polarized area inside the membrane. Salutatory conduction: the leaping of the action potential form node to node. The neurotransmitter binds to the receptor; specific channels open such as sodium making it a excitatory post- synaptic potential. Charles scott sherington- coined the term synapse to describe the specialized gap that excited between neurons. Reflexes are slower than the conduction along the axon. Several weak stimuli presented at slightly different times and locations. Produces a stronger reflex than a single stimulus. The first action potential occurs in the axon hillock. The graded electrical potential that is positive is depolarization and negative= polarization. When an action potential occurs in the axonal ending, calcium (positive charge) channels open. Temporal summation: happens in graded electrical potential (they can summate) Spatial summation: happens in graded electrical potentials (charles scott sherington)
