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.
Mazatlan, a southern Mexico city, experiences average highs of 90 to 92 degrees in July and August. The average lows during these two months is between 76 and 80 degrees. The coolest month in Mazatlan is January, when high temperature reach an average between 80 and 82 degrees and lows are 66 to 68 degrees.