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.
1 Mexico ranks number 10 in the list of countries by population. 2  The population density in Mexico is 66 per Km2 (171 people per mi2).  The total land area is 1,943,082 Km2 (750,228 sq. miles)