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.
This could produce a number of individuals that have a mutation that would make them unable to deal with life in that environment. Or the same change would allow them to do exceedingly well. This mutation would, over a very long time, produce a different species. Speciation that results when a population is separated by a physical barrier is allopatric speciation. Sympatric speciation is speciation that occurs without physical separation of members of the population. Some examples of sympatric changes occurred long ago when people live in small villages.