BIO271H1 Lecture : Lecture 2

• School: UTSG
• Department: Biology
• Course: BIO271H1
• Professor: Ohana

Document Summary

hyperpolarization mp more polarized: absolute refractory period. cell capable of generating a new ap: relative refractory period. more difficult to generate new ap: voltage-gated channels responsible for ap, na channels open first depolarization, k channels open slowly repolarization, na channels close www. notesolution. com. absolute refractory period caused by deactivations of na channels: k channels close slowly. all aps are same magnitude: self propagating. an ap triggers the next ap in adjacent areas of membrane without degradation: electronic current spread. charge spreads along membrane: regnerative cycle. Ion entry electronic current spread t riggering of ap: **na that enters the axon through voltage-gated na channels induces a local depolarization, this local depolarization spreads along the axon via electronic conduction, t riggering additional. Aps further down the axon; this process continues down the axon each ap is essentially the same as the preceding ones, resulting in conduction without decrement: myelination, vertebrate neurons are myelinated, myelin.