(2) A motor neuron in the ventral horn of the spinal cord is activated, and an action potential passes outward in a ventral root of the spinal cord. (3) The axon branches to supply a number of muscle fibers called a motor unit, and the action potential is conveyed to a motor end plate on each muscle fiber.
The average male height varies from country to country. The estimated average height for the human male across the world is approximately 5ft 8 1/2in (1.73 m.) According to John Komlos of the University of Munich, North Americans were the tallest people on the planet from about the American Revolution to World War II.
Boys Height Growth Chart â average height of boys age 2 â 18 years. for children of  White  race/ethnicity*, ages 2 through 18.ee the chart index. Charts for adults male average height for men and average weight for men are available here. These are also interesting, because they not only show the average height, they also show that adults have a considerably higher prevalence of obesity than children.