Question

What carries the signal from the neuron deep into the muscle fiber?

Answer 1

Synaptic transmission caries the signal form the neurons to the muscle cell.calcium enters and stimulates the relase of neurotransmitor acetyl choline by the somatic motor neurons.the released acetyl choline binds to the receptors on the muscle cell menbrane.binding of acetyl choline opens the ions chanels and sodium ions diffuse into muscle cells. The enzyme acetylchlinesterase catalises the breakdown of acetyl choline in the synaptic cleft and prevents over contraction . The positive sodium ion gets depolarised and exites the muscle cell membrane.This signal is transfered to the T- tubules are the invaginations of the sarcolemma which penetrate deep into each myofiber allow electrical signals to be carried into the myofiber in the muscle tissue.