BIOL3030 Lecture Notes - Lecture 5: Brainstem, Acetylcholine, Neurotransmitter
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11 Sep 2015
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Interneurons: evolution of the spinal nerve pattern, not all vertebrates have the mammalian pattern, physical separation of the dorsal and ventral roots in lamprey (cid:224) don"t have a spinal cord, neurophysiology, somatic sensory neuron in dorsal spinal nerve, somatic motor neuron in ventral spinal nerve, physiological basis of sending an electronic signal, negative resting membrane potential, changes to produce signal, only a very thin shell of charge difference is needed to establish a membrane potential ( 70 mv, sodium potassium pump, 3 na+ ions moved out, 2 k+ ions moved in, uses atp to power protein conformational changes, graded potentials can be excitatory (create an action potential) or inhibitory where an action potential is less likely, the size of a graded potential is proportional to the size of the stimulus, graded potentials decay as they move over distance, action potentials, if stimulus is strong enough it will create an action potential, all or none sequence of changes in membrane potential.
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