Quick Answer. The function of motor neurons is to release the neurotransmitter acetylcholine, which are released at a junction known as the neuromuscular junction, that bind to postsynaptic receptors, causing the muscle fiber to respond and result into a muscle movement.
Adapted from The Gap: The Science of What Separates Us From Other Animals by Thomas Suddendorf, out now from Basic Books. Like many a scholar before and since, Bertrand Russell confidently asserts that certain traitsâspeech, fire, agriculture, writing, tools, and large-scale cooperationâset humans apart from animals. Although we appear to excel in many domains, such claims are not typically founded in any thorough comparison.
In my own field of evolutionary biology, races of animals (also called âsubspeciesâ or âecotypesâ) are morphologically distinguishable populations that live in allopatry (i.e. are geographically separated). There is no firm criterion on how much morphological difference it takes to delimit a race.