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Can someone please explain.. I don't get the quick and slow parts.. 1. During action potentials in...

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Medical Sciences

Can someone please explain.. I don't get the quick and slowparts..

1. During action potentials in the heart,

a. voltage-gated K+ channels slowly repolarize; voltage-gatedNa+ channels slowly depolarize; voltage-gated calcium channelsquickly depolarize; voltage gated K+ channels slowly repolarize

b. voltage-gated K+ channels quickly repolarize; voltage-gatedNa+ channels quickly depolarize; voltage-gated calcium channelsquickly depolarize; voltage gated K+ channels quicklyrepolarize

c. voltage-gated K+ channels quickly repolarize; voltage-gatedNa+ channels slowly depolarize; voltage-gated calcium channelsslowly depolarize; voltage gated K+ channels quickly repolarize

d. voltage-gated K+ channels quickly repolarize; voltage-gatedNa+ channels quickly depolarize; voltage-gated calcium channelsslowly depolarize; voltage gated K+ channels quickly repolarize

Answer & Explanation Solved by verified expert
3.9 Ratings (458 Votes)
Option D During action potentials in the heart In Myocradial cells Action potential aVoltagegated Na channels quickly depolarize bvoltagegated K channels quickly repolarize In Pacemaker cellsSA node and AV nodeAction potential avoltagegated calcium channels slowly depolarize bvoltage gated K channels quickly repolarize IN MYOCARDIAL CELLS As stimulus reaches myocardial cellsSome positive ions enter the myocardial cellRMP changes from 90 mv to 70 mVThreshold PotentialAt 70 mV Voltage gated Sodium    See Answer
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