Steps of the nerve Impulse
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What are the 5 steps of an action potential?
• resting potential • threshold • action potential • depolarization • hyperpolarization
• Resting potential -what is the mV -what is the state of the gates -what is the charge of outside and inside
-70 both na and K gates are closed the inside is negative
• Threshold -what does the stimulus trigger -what is the mV
-opening of a few non voltage gates (Na+) (-55mV)
• Action Potential -what gate opens -what happens to the membranes polarity -What is the mV
-voltage gates for Na+ -reversed and therefore depolarized (35mV)
• Depolarization -what does the peaking voltage trigger (2) -What else asists in the repolarization process, what does it pump in and out + how many -what is the time period known as for repolarization -can an impulse be activated during this time?
-the closing of voltage gated Na+ channels and opens up voltage gated k+ channels for k+ to diffuse out of the axon -Na+/k+ pump will asist by activley pumping out 3Na+ for every 2k+ that enters. -Refractory period -no
• Hyperpolarization -what is it -what does it result from and lead back to
-undershoot of the resting potential -because K+ channels close slowly and membrane goes back to resting potential