Pacemaker activity and action potential: autorhythmic and contractile cells
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11 Terms
addition of potassium channels ______ membrane potential
decrease
decrease of potassium channel _____ membrane potential
increase
addition of calcium channels _____ membrane potential
increase
decrease of calcium channels _____ membrane potential
decrease
what helps -60 mv membrane potential to go to -40mv threshold at the very start?
increase in sodium and opening of funny channels, decrease in potassium. much more changes follow
what helps -90 mv membrane potential to go to -70 mv threshold at the very start?
increase in sodium only and we don’t do anything else until we get to 30mv
what are ions are necessary for membrane potential?
calcium, potassium, sodium
transient type calcium channels
open for a short time
long lasting calcium channels
last for a much longer time than the other calcium channel
why don’t we immediately open the long lasting calcium channels in pacemaker activity?
because then we wouldn’t have a threshold for efficient timing