PSY100H1 Lecture Notes - Lecture 3: Phineas Gage, Medulla Oblongata, Membrane Potential
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PSY100H1 Full Course Notes
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Plan for today: results of class experiment, biological bases of behavior, communication in the nervous system, organization of the nervous system, researching the brain. Axon: myelin insulates the nerve cell, speeds up conduction of nerve messages, terminal buttons of the axon release transmitter. Neuron resting potentials: the membrane of the neuron separates charges. The ions na+ and cl- are found outside the membrane, whereas the ion. K+ ions, so that at rest, the inside is about -70 millivolts relative to the outside. At rest, few na+ ions are able to cross the membrane. Cross-section of nerve cell showing distribution of ions across the membrane. The restoration of the membrane potential to -70 mv is produced by an opening of channels to k+ The ap is conducted along the axon toward the terminals. Nts are stored within vesicles of the presynaptic cell. Nts are released in response to the action potential sweeping along the presynaptic membrane.
