PSY100Y5 Lecture Notes - Lecture 3: Axon Hillock, Monoamine Oxidase, Bipolar Disorder
13
PSY100Y5 Full Course Notes
Verified Note
13 documents
Document Summary
Psy 100: intro psychology - lecture 3: brain and behaviour. Axon: carry electrical info, myelin insulates the nerve cell, speeds up conduction of nerve messages. More myelinated prone to effects of learning. Life sustaining e. g. heart: terminal buttons of the axon release transmitter. Full of vesicles containing neurotransmitter: some axons are very long but most aren"t and communicate in the brain. 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. Does not open up a channel: anti-anxiety. Some reception sites are specialized or accept any neurotransmitter: if it doesn"t bind, reuptake back into vesicles, if bound, degraded by enzyme monoamine oxidase, some receptor sites are autoreceptors that regulate levels of neurotransmitter. All have agonists and antagonists that block their function: e. g. nicotine.
