This preview shows page 1. Sign up to view the full content.
Unformatted text preview: s shit WELL!!!!!! Action Potential
Flow of information refers to propagation of an action potential
(electrical activity) STIMULUS action potetnials--ﬁre all or nothing manner
Threshold • Brief change from negative to positive
in transmembrane potential
• All-or-none response: amplitude of AP
does not change based on magnitude
of stimulus if the sensation is ore intense it just ﬁres faster not in varying strength. depolarization--chemicals cross the cell membrane and cause a
depolarixation that sends an impiulse down the axon.
n it repolarizes the opposite reaction happens really important!!!!!!!!!! inﬂux- Na exful-K Action Potential know this shit know this shit konw this shit
• Action potential is the
result of the influx and efflux
of sodium (Na+) and
potassium (K+) ions,
respectively, across the
membrane Threshold depol--membrane becomes more positive
repol-- membrane returns to resting value Depolarization – membrane potential more positive than resting potential
Repolarization – return of membrane potential to resting value
Hyperpolarization – membrane potential more...
View Full Document
This document was uploaded on 03/28/2014 for the course KNES 385 at Maryland.
- Fall '08