Best Answer: In humans there are two. Glycogen, which is a long chain carbohydrate made by polymerising glucose molecules together, is stored in the liver and, in small amounts, in the muscles. It provides a fast boost of energy for short intense exercise.
A freshman is 9th grade - 14 - 15 yrs. old. A junior is in the 11th year of school./ A senior is in the 12th and final year of high school. Ages vary but a junior is 16-17 years old and a senior is 17-18 years old. Junior is 11 grade, senior is 12 grade (for high school) A junior would be around 17 and a senior around 18.
Students in these schools never use nicknames for Junior High School grades and rarely for Senior High School. If they do, however, a Freshman will be grade 10, and then Juniors and Seniors in grades 11 and 12. Having a Junior and Senior High School is getting rarer though, since it messes with sports eligibility. Freshmen: Tough year ahead... It's kinda hard being a freshman at my school.