BISC306 Lecture Notes - Lecture 7: Neuromuscular Junction, Brainstem, Axon Hillock
16 Sep 2016
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Friday 9/16/16: axons & action potentials, action potential propagation and synaptic transmission, axons of different lengths in different animals and varied parts of the body b. i. Shorter axons (like in the brain) are often nin-spiking axons: synaptic transmission-passing of messages from one input to a neuron c. i. Current is injected or input of a type of neurotransmitter c. iii. Changes travel from axon hillock across axon to synapse: axon hillock-able to measure action potentials firing in order to pass on the incoming message d. i. Higher stimulus leads to higher membrane potential change: graded response-change in voltage potential that the dendrites input and sends to the soma by electronic transmission e. i. Change in voltage potential=initial voltage value (e-x/lambda) b. ii. As lambda increases, resistance increases and axon diameter increases b. iii. 1. b. iii. 2. b. iii. 3. The larger the lambda, the faster the signal transmission. Causes k+ to leak out of the cell and cause less of a current.
