years Puberty nearly complete years Full adult

Years puberty nearly complete years full adult

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Middle- 14-16 years-Puberty nearly completeLate- 16-18 years-Full adult appearance Anticipation of adult rolesPuberty: Transition to Adulthood Hormonal Changes in Puberty -Endocrine glands Pituitary gland -mastery gland Testes and ovaries -sex hormones released-Testosterone for males-Estrogen for girls -Yet both types are present in each gender simply they differ in quantityBody Growth -Growth spurtoGirls attain most of their height by 16.oBoys continue to grow until 18-20 .-Muscle-Fat ProportionsoMuscle fibers become thicker and denser.oBy age 17, boys are about 3 times stronger than girls.oGirls have a rise in body fat while boys have a drop.-Joint development improves coordination. Sexual MaturationPrimary sexual charactisics Maturation of the reproductive organs-girls: menarche; ovaries, uterus, and vagina-Boys- spermache; testes and penisSecondary sexual charactisics: visible signs of sexual maturity Breasts, facial hair, arm pit hairSexual Development in GirlsMenarche- First Menstruation -Average age- around 12 ½ in US-Decline in the average age in US – a secular trend (about a decade)
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Due mainly to changes in diet and lifestylePregnancy can occur after menarche Individual Differences in Timing of Puberty Heredity Nutrition, exercise, -body fat in girls,Geographical locationSESEthnic groupSecular Trend Sexual Development in Boys Spermache(first ejaculation) occurs around the age 13 ½ in the U.S.Genital development and pubic hair development precedes the end of the growth spurt. Development of beard and voice changes occur near the end of the sequence. Consequences of Timing PubertyEarly Maturing GirlsUnpopular; withdrawn low confidence, more deviant behavior, negative body image, more long term problem sBoys Popular, confident, independent, positive body image Late MaturingGirlsPopular, sociable, lively, school leaders, positive body image BoysUnpopular,, anxious, talkative, attention –seeking, negative body imageAdolescent Health Sensation seeking -increased levels of arousal-Peer acceptance-Gain autonomy from parents-Popular media’s messages may influence risky behaviorAdolescent Sexuality-North American attitudes relatively restrictive oMedia contradicts family messages Abstinence programs-More liberal over past 40 years oMost say premarital sex oOK for committed partners -Activity matches attitudes oRates declining since 1990sAdolescent Contraptive UseRecent increase in use But many Americans do not use
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Reasons for not using: -concern about image-adolescent risk – taking -social environment -forced intercourse-unrealistic about consequences -STDs-Teens have the highest rates of stds(1 out of 6)=untreated can lead to sterility and life- threatening complications Most serious STD is AIDSOther common STDsChlamydia CytomegalovirusGenital wartsGonorrheaHerpes Syphilis -Fail to discuss condom use with adolescents
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