PSYC 2103 Study Guide - Quiz Guide: College Board, National Council Of Educational Research And Training, Sex Organ
Document Summary
Chapter 9: adolescence: body and mind: describe puberty and the associated milestones for girls and boys the time between the first onrush of hormones and full adult physical development. Girls: nipple growth (10yrs)-pubic hair forms (11 yrs. )-widening of the hips(12 yrs. menarche (12-13 yrs. ) A day and night cycle of biological activity that occurs approximately every 24 hours. The hypothalamus and pituitary regulate the hormones that affect the biorhythms. 2/3 of all variations in age of puberty are genetic. African americans reach puberty earlier than european or hispanics, whereas chinese americans average late starting dates. Another major influence on the onset of puberty is body fat in girls. Most girls must weigh at least 100 lbs. to start puberty. Children under stress experience earlier puberty as well: understand physical changes in adolescence bones lengthen and harden, children eat more and gain weight. A year or two later, muscle spurt follows.
