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.
The separate populations over time may evolve distinctly different characteristics. If the geographical barriers are later removed, members of the two populations may be unable to successfully mate with each other, at which point, the genetically isolated groups have emerged as different species.Allopatric isolation is a key factor in speciation and a common process by which new species arise.he extent to which a geological barrier can effectively isolate a population correlates to the mobility of the organism or its offspring. For example physical barriers such as canyons may effectively block migration and dispersal of small mammals; however, have little impact on flying birds or wind-borne seeds.