True/False: Axial current can be found without knowing the ionic and capacitive

Question

True/False: Axial current can be found without knowing the ionic and capacitive current and by just knowing the trans membrane potential The following illustration represents the trans membrane potentials (in mV) in 8 adjacent cells/nodes of a fiber. In the boxes below show the direction of the intercellular axial currents between the cells In problem (ii) what is the direction of trans membrane current at sites 4 and 6 (i.e. where Vm is 10 and 100mV respectively). Explain your answer True/False: Multiple excitations can propagate in a nerve fiber. If a stimulus generates an AP in a fiber is followed by a second stimulus of same intensity after an interval of 4 m sec then it will initiate a second AP.

Explanation / Answer

1. i ) The answer is False because the axial current ( Ia ) is the intracellular flow that occurs due to either the capacitive current ( Ic ), which depolarizes the membrane potential or as membrane current flowing through the ionic channels ( Ii ).

iv ) True : A stimulus generates an Action potetnial ( AP ) because the AP is said to be all or none signals, since either they occur fully or dont occur at all. follwed by the second stimulus of same intensity after an interval of 4 m/sec which would initiate a second action potential after the refratory period of first AP stages. ( The Action potential possesses 3 stages - Depolarization, Repolarization and Refractory period) .

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