The following steps are involved in muscle contraction: (1) The sequence of events leading to contraction is initiated somewhere in the central nervous system, either as voluntary activity from the brain or as reflex activity from the spinal cord.
The average Mexican man weighs 165 pounds and stands 5 feet 4 1/2 inches tall, while the median figures for Mexican women are 151 pounds and 5 feet 2 inches, according to a study released by a group representing Mexico's clothing industry.
The average adult American male (20 years and older) is 195.5 pounds, according to the CDC. As with height, averages vary by racial and ethnic groups. For example, the average adult non-Hispanic white male weighs 199.2 pounds, and the average adult non-Hispanic black male weighs 199.4. The average adult Hispanic males weight 186.1 pounds. Among adult Mexican American males -- who are also included in the category of Hispanic -- the average weight is 185.4. Weight also varies by country. Here are a list of nine countries and how they stack up with the US.