PSY100Y5 Lecture Notes - Lecture 3: Nicotine, Acetylcholine, Frontal Lobe
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PSY100Y5 Full Course Notes
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Myelin insulates the nerve cell, speeds up conduction of nerve messages. Terminal buttons of the axon release transmitter. Stimulation of the nerve membrane can open ion channels in the membrane. Na+ ions owing in will depolarize the membrane (movement from -70 mv to -60 mv) K+ ions owing out of the membrane will hyper polarize the membrane (-70 mv to -90 mv) Graded potentials are generated at the dendrites and are conducted along the membrane to the axon hillock. If the summated activity at the axon hillock raises the membrane potential past threshold, an action potential (ap) will occur. During the ap, na+ ions ow into the cell raising the membrane potential to +40 mv, producing the spike. 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. Motor control, learning, sleep, dreaming, ability to create memories and access memories.
