(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.
Frequent wars and a rise in the spread of deadly diseases impacted population health and height, as well. Today, average height in American men is about 5 feet 9 inches and in American women 5 feet 4 inches.According to a study completed in 2002 (see the article by John Carvel at the Guardian), Britons have similar average heights, while most Europeans are an inch or two shorter.requent wars and a rise in the spread of deadly diseases impacted population health and height, as well. Today, average height in American men is about 5 feet 9 inches and in American women 5 feet 4 inches.