Question

what is the importance of sodium and calcium channels on a neuron and why action potentials do not occur when the channels are inhibited?

Answer 1

Voltage gated sodium channels play a important role in the action potentials

If channels are open there is change in the cell membranes potential and a number of na+cells move into the cells(down their electrochemical gradient) causing depolarisation

voltage gated calcium channels play important role in both muscle excitation and contraction as well as neuronal excitation with transmitter release

when these channels are blocked the membrane cannot be depolarised so there is action potentials

When calcium channels are blocked electrical conduction is decaresed and also decrease the force of contraction of muscle cells