Question

Which part of this sentence is wrong? "The depolarizationphase of an actionpotential in an axon, skeletal...

Which part of this sentence is wrong?

"The depolarizationphase of an actionpotential in an axon, skeletal muscle and heartmuscle cell, are the concequences of transmembrane sodium flow."

Is it because it's not in an axon but in the triggerzone? Or because of something else?

Thx in advance
Science   Anatomy-And-Physiology   
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Homework Answers

Answer #1

The depolaristion phase for for the heart muscle cell are the consequences of transmembrane sodium flow is False.

Depolaristion of heart SAN,AVN and Purkinje fibers is due to transmembrane Ca+2 outflow.

Sodium is for ventricle and atrial contractile muscle fibers.But Heart muscle fibers contain nodal fibers, they need Ca+2 for depolarization.calcium ions are main for the depolarization.

In the given sentence

It is true for nerve and skeletal muscle,but it is false for Heart muscle.

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