© 2013 by McGraw-Hill Education. This is proprietary material solely for authorized instructor use. Not authorized for sale or distribution in any manner. This document may not be copied, scanned, duplicated, forwarded, distributed, or posted on a website, in whole or part. Physical Development and Health in Adolescence Chapter 14

© 2013 by McGraw-Hill Education. This is proprietary material solely for authorized instructor use. Not authorized for sale or distribution in any manner. This document may not be copied, scanned, duplicated, forwarded, distributed, or posted on a website, in whole or part. Adolescence Developmental transition between childhood and adulthood Entailing major physical, cognitive, and psychosocial changes

© 2013 by McGraw-Hill Education. This is proprietary material solely for authorized instructor use. Not authorized for sale or distribution in any manner. This document may not be copied, scanned, duplicated, forwarded, distributed, or posted on a website, in whole or part. Puberty Process by which a person attains sexual maturity and the ability to reproduce

© 2013 by McGraw-Hill Education. This is proprietary material solely for authorized instructor use. Not authorized for sale or distribution in any manner. This document may not be copied, scanned, duplicated, forwarded, distributed, or posted on a website, in whole or part. How Puberty Begins: Hormonal Changes Increase in gonadatropin releasing hormone (GnRH) leads to a rise in reproductive hormones Follicle-stimulating hormone (FSH) Luteinizing hormone (LH) Puberty is marked by: Activation of the adrenal glands Maturing of the sex organs

© 2013 by McGraw-Hill Education. This is proprietary material solely for authorized instructor use. Not authorized for sale or distribution in any manner. This document may not be copied, scanned, duplicated, forwarded, distributed, or posted on a website, in whole or part. How Puberty Begins: Hormonal Changes First stage of puberty occurs between ages 6 and 8 Adrenal glands located above the kidneys secrete increasing levels of androgens Maturing of the sex organs triggers a second burst of DHEA production

© 2013 by McGraw-Hill Education. This is proprietary material solely for authorized instructor use. Not authorized for sale or distribution in any manner. This document may not be copied, scanned, duplicated, forwarded, distributed, or posted on a website, in whole or part. Timing, Signs, and Sequence of Puberty and Sexual Maturity Organs directly related to reproduction enlarge and mature during adolescence Primary sex characteristics Physiological signs of sexual maturation that do not involve sex organs Secondary sex characteristics

© 2013 by McGraw-Hill Education. This is proprietary material solely for authorized instructor use. Not authorized for sale or distribution in any manner. This document may not be copied, scanned, duplicated, forwarded, distributed, or posted on a website, in whole or part. Timing, Signs, and Sequence of Puberty and Sexual Maturity Signs of puberty Breast tissue and pubic hair in girls Enlargement of the testes in boys Voice deepens, especially in boys Skin becomes coarser and oilier Increased activity of the sebaceous glands causes pimples and blackheads

© 2013 by McGraw-Hill Education. This is proprietary material solely for authorized instructor use. Not authorized for sale or distribution in any manner. This document may not be copied, scanned, duplicated, forwarded, distributed, or posted on a website, in whole or part. Timing, Signs, and Sequence of Puberty and Sexual Maturity Adolescent growth spurt Sharp increase in height and weight that precedes sexual maturity Contribution to pubertal growth Growth hormone Sex hormones - Androgens and estrogen Girls’ growth spurt usually occurs 2 years earlier than that of boys

© 2013 by McGraw-Hill Education. This is proprietary material solely for authorized instructor use. Not authorized for sale or distribution in any manner. This document may not be copied, scanned, duplicated, forwarded, distributed, or posted on a website, in whole or part.

Timing, Signs, and Sequence of Puberty and Sexual Maturity Principal sign of sexual maturity in boys is sperm production Spermarche Boy’s first ejaculation Principal sign of sexual maturity in girls is menstruation Menarche Girl’s first menstruation

© 2013 by McGraw-Hill Education. This is proprietary material solely for authorized instructor use. Not authorized for sale or distribution in any manner. This document may not be copied, scanned, duplicated, forwarded, distributed, or posted on a website, in whole or part. Timing, Signs, and Sequence of Puberty and Sexual Maturity Influences on the timing of puberty Secular trend Can be seen only by observing several generations Average age of sexual maturity is earlier in developed countries than in developing countries Combination of genetic, physical, emotional, and contextual influences affect the timing of menarche

© 2013 by McGraw-Hill Education. This is proprietary material solely for authorized instructor use. Not authorized for sale or distribution in any manner. This document may not be copied, scanned, duplicated, forwarded, distributed, or posted on a website, in whole or part. Nutrition and Eating Disorders Anorexia nervosa Eating disorder characterized by self-starvation and extreme weight loss Bulimia nervosa Eating disorder in which a person regularly eats huge quantities of food Purges the body by laxatives, induced vomiting, fasting, or excessive exercise