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 largest mountain in Mexico is El Pixo de Orizaba. This mountain, which was formerly a volcano, is among the highest mountains in North America. Only Denali and Mount Logan are taller. The summit of El Pixo de Orizaba is approximately 18,900 feet above sea level--this is about three and a half miles.