NATS 1675 Study Guide - James Mourilyan Tanner, Tanner Scale, Pubic Hair

• School: York University
• Department: Natural Science
• Course: NATS 1675
• Professor: Ruthanna Dyer

Document Summary

Physical changes that occur during puberty are usually marked by distinct stages of development known as tanner stages. These were named after james mourilyan tanner, who first identified them. The tanner stages give average dates of development, although there are variation among children and teenagers. You should not worry if you reach a stage of puberty before or after your friends do. Tanner stage one describes the changes that take place in your body before the onset of puberty. (known as pre-pubertal changes) In boys changes usually occur at 9-11 years of age you will grow taller by 5-6cm a year (2-2. 4 inches) In girls usually occurs at the age of 13. During puberty, your body becomes more sensitive to the hormone testosterone, which is present in both boys and girls. Testosterone causes small glands in your skin to produce too much oil (sebum).