(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.
For example, the average adult non-Hispanic white male is 5 feet 9.8 inches tall and the average adult non-Hispanic black male is 5 feet 9.5 inches tall. The average height of adult Hispanic males is 5 feet 7.1 inches. Among adult Mexican American males -- who are also included in the category of Hispanic -- the average height is 5 feet 6.9 inches. Height also varies by country. Here are a list of 15 countries and how they stack up with the US.