Acetylcholine is the neurotransmitter used at the neuromuscular junction —in other words, it is the chemical that motor neurons of the nervous system release in order to activate muscles. Source: Internet
ALS is a disease of the spinal cord, which can be triggered by the accumulation of misfolded proteins in motor neurons, the nerve cells in the spinal cord that drive movement. Source: Internet
Although for the simplest reflexes there are short neural paths from sensory neuron to motor neuron, there are also other nearby neurons that participate in the circuit and modulate the response. Source: Internet
Acetylcholine is released from presynaptic neurons into the synaptic cleft. Source: Internet
After being weighted and transformed by a function (determined by the network's designer), the activations of these neurons are then passed on to other neurons. Source: Internet
After chronic use, neurons adapt to the change in biochemistry, resulting in a change in pre- and postsynaptic receptor density and second messenger function. Source: Internet