Oakland Athletics. The Oakland Athletics (often abbreviated to A's) are an American professional baseball team based in Oakland, California. The Athletics compete in Major League Baseball (MLB) as a member club of the American League (AL) West division. The club plays its home games at the OaklandâAlameda County Coliseum.
In early adulthood (ages 20â40), our physical abilities are at their peak, including muscle strength, reaction time, sensory abilities, and cardiac functioning. The aging process also begins during early adulthood and is characterized by changes in skin, vision, and reproductive capability.
1. Proportion of body water declines during first 2 - 3 years of life, then reaches levels similar to adults. 2. Proportion of lean body mass increases throughout infancy and childhood. 3. During adolescence, males secrete testosterone and gain more muscle mass than females (2/3 as much lean body mass as males)