How does the Nervous Tissue Cause Action
Nervous tissue collects the information from various receptors, processes the same and decides the response. The response is conveyed to particular muscle fibre through axon terminal of a motor neuron.
The knob or Douton of the axon terminal (motor-end plate) comes close to a depression or sole plate over the surface of the muscle fibre. As the excitation reaches the knob, the latter releases neurotransmitter. The neurotransmitter (e.g., acetylcholine) is picked up by receptors of sole plate. They become activated. They cause release of calcium from sarcoplasmic reticulum.
It brings about movement of myosin fibrils over actin fibrils. It causes shortening and change in shape of the muscle fibre. It is translated into movement. Nerve controlled functioning of gland, her organs and tissues also follow the same procedure.