PS101 Lecture Notes - Lecture 3: Acetylcholine, Grey Matter, Hindbrain
Document Summary
Resting potential: the electrical charge of a neuron when it is at rest, battery 70 millivolts, negative charge. Action potential: the rapid reversal of voltage across axon membranes is caused by the movement of ions across the membrane, stimulated, channels in membrane open, +vely charged sodium ions enter, shift in electrical charge. Stronger stimuli causes more neurons to fire and more often. Control the nutrient supply to neurons, destroy and move diseased and dead neurons, and provide axons with their myelin sheath. One of two processes terminate the activity of the neurotransmitter and halts communication: reuptake neurotransmitters are drawn back into the presynaptic neuron and recycled for future use. Enzymatic degradation breaking down neurotransmitters with enzymes. Acetylcholine between motor neurons and voluntary muscles: throughout nervous system, agonists excite increase likelihood of firing (black widow, antagonists opposes decreases likelihood of firing.
