Question

During action potentials in the heart, the following occurs in order: a)voltage-gated K+ channels quickly repolarize;...

During action potentials in the heart, the following occurs in order:

a)voltage-gated K+ channels quickly repolarize; voltage-gated Na+ channels slowly depolarize; voltage-gated calcium channels slowly depolarize; voltage gated K+ channels quickly repolarize

b)voltage-gated K+ channels quickly repolarize; voltage-gated Na+ channels quickly depolarize; voltage-gated calcium channels slowly depolarize; voltage gated K+ channels quickly repolarize

c)voltage-gated K+ channels slowly repolarize; voltage-gated Na+ channels slowly depolarize; voltage-gated calcium channels quickly depolarize; voltage gated K+ channels slowly repolarize

d)voltage-gated K+ channels quickly repolarize; voltage-gated Na+ channels quickly depolarize; voltage-gated calcium channels quickly depolarize; voltage gated K+ channels quickly repolarize

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Answer #1

b)voltage-gated K+ channels quickly repolarize; voltage-gated Na+ channels quickly depolarize; voltage-gated calcium channels slowly depolarize; voltage gated K+ channels quickly repolarize.

Cardiac action potential phases

Phase 0 ( Depolarisation ) -->Rapid phase because of sodium influx

Phase 1( Early repolarisation ) -->Closure of Sodium and Potassium efflux rapid

Phase 2 ( Sustained ) --->Calcium influx ( Slow ) also Potassium efflux .

Phase 3 ( Late repolarisation ) -->Potassium efflux ( closure of Calcium channels ) Rapid

Phase 4 ( Full repolarisation ) --> Potassium efflux continued and Resting potential restored .

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