3 Puberty, Health, and Biological Foundations. Puberty The period of rapid physical maturation...
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Transcript of 3 Puberty, Health, and Biological Foundations. Puberty The period of rapid physical maturation...
![Page 1: 3 Puberty, Health, and Biological Foundations. Puberty The period of rapid physical maturation involving hormonal and bodily changes that take place primarily.](https://reader036.fdocuments.net/reader036/viewer/2022062517/56649f1a5503460f94c2fe19/html5/thumbnails/1.jpg)
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Puberty, Health, and Biological Foundations
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Puberty
• The period of rapid physical maturation involving hormonal and bodily changes that take place primarily in early adolescence
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Feedback System of Sex Hormones
LH-RF (lutenizing hormone-releasing factor) and FSH-RF (follicle stimulating hormone-releasing factor) stimulate pituitary gland
LH (lutenizing) and FSH (follicle stimulating) stimulate gonads
(Testes in males, ovaries in females)
Fig. 3.3
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The Endocrine System
• Hypothalamus– Structure in the brain– Secretes releasing factor
• Pituitary Gland– Regulates other glands– Secretes FSH and LH
• Gonads– Testes, ovaries– Secretes sex hormones
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The Endocrine System
Major Endocrine Glands Involved in Pubertal Change
Fig. 3.2
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Hormones
• Powerful chemicals secreted by the endocrine glands; carried through the body by the bloodstream.
Androgens: The main class of male sex hormones
Estrogens: The main class of female sex hormones
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Adrenarche
• Involves hormonal changes in the adrenal glands, from about 6-9 years of age– Gonadarche: What most people think
of as puberty; involving sexual maturation and development of reproductive maturity
– Spermarche: A boy’s first ejaculation of semen
– Menarche: A girl’s first menstrual period
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Growth Spurt
• Occurs 2 years earlier for girls (age 11.5) than boys (13.5) on average
• Girl increase 3.5 inches per year, boys about 4, during this period
• Weight gain follows roughly same timetable as height gain
• Girls gain hip width while boys gain shoulder width
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Growth SpurtPubertal Growth Spurt
Fig. 3.4
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Sexual Maturation
• Males
– Increase penis and testicle size – Pubic hair– Voice change– Spermarche – Armpit hair – Facial hair
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Sexual Maturation
• Females
– Breasts enlarge – Pubic hair– Armpit hair– Menarche
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Sexual Maturation
Fig. 3.5
Normal Range and Average Development of Sexual Characteristics in Males and Females
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The Age at Menarche has Declined
Median Ages at Menarche in Selected Northern European Countries and the United States from
1845 to 1969
Fig. 3.7
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Psychological Dimensions of Puberty
• Body Image• Hormones and Behavior• Menarche and the Menstrual Cycle• Early and Late Maturation• Are Puberty’s Effects Exaggerated?• http://www.youtube.com/watch?
v=Di2Tgx05EjM&mode=related&search=