Exam 4 - Adolescents (Chapter 8 & 9) Flashcards
Puberty
The hormonal and physical changes by which children become sexually mature human beings and reach their adult height.
Puberty Rites
A “coming of age” ritual is held in traditional cultures to celebrate children’s transition to adulthood.
Secular trend in puberty
A decline in the average age at which children reach puberty.
Menarche
first menstruation was the signal for celebrating the entrance into womanhood
Spermarche
male signal of fertility, or first ejaculation of live sperm, is a hidden event
HPG Axis
The main hormonal system that programs puberty;
- involves a triggering hypothalamic hormone that causes the pituitary to secrete its hormones
- which in turn causes the ovaries and testes to develop
- secrete the hormones that produce the major body changes.
Adrenal Androgens
Hormones are produced by the adrenal glands that program puberty.
Puberty rites usually involve feelings of
- anxiety
- awe
- self-efficacy
How has the start of puberty changed from the past to today
-
Today:
- starts at 9 or 10
-
Past:
- The 1860s: Over 17
- The 1960s: dropped to 13
Pregnancy age change
in the past girls were not pregnant until their late teens, now before teens
Menarche used as a benchmark for
charting secular trends
nation’s economic development (SES)
Black menstruation pattern
US African American girls begin menstruating at: close to age 12
Impoverished African Countries begin at: over 16
Puberty programmed by
2 command centers
- System 1 - in adrenal glands
- Begins to release hormones at age 6 - 8
- System 2 - HPG axis: Produces major body changes
- Involves hypothalamus, pituitary, and gonads
Puberty set off by
3 phase chain reaction at Age 9 or 10
- Bursts of hypothalamic hormone stimulate the pituitary gland
- Causes ovaries & testes to secrete several closely related compounds called estrogens and testosterone
- Blood concentrations of estrogens and testosterone float upward and unleash physical transformation
Primary Sexual Characteristic
Physical changes of puberty directly involve the reproductive organs, such as the growth of the penis and the onset of menstruation.
Growth spurt
A dramatic increase in height and weight occurs during puberty.
Secondary Sexual Characteristic
Physical changes of puberty are not directly involved in reproduction, such as female breast development and male facial hair.
Testosterone
The hormone is responsible for the maturation of the male reproductive organs and other signs of puberty in men, and for hair and skin changes and sexual desire in both sexes.
Both girls and boys produce
estrogen and testosterone
Mostly Estrogens = females
All Testosterone = male
Responsible for sexual arousal in females and males
- Testosterone
- Adrenal androgens
What primes the triggering hypothalamic hormone?
- Genetics
- Exposure to light
- Chemicals in water
- Food
- Environmental stress
- Leptin
- Body fat
Weight and puberty delays
- Undernutrition = delays puberty
- Obesity = speeds up puberty
A dramatic early sign of puberty in girls
the growth spurt (speed picks up, then decreases )
Breasts and pubic hairs become visible when
6 months after the growth spurt begins
Menarche occurs
in middle to final stages of breast and pubic hair development
Can girls get pregnant when reaching menarche
yes - but often window of infertility until the system fully gears up.
Does puberty unfold the same way for every girl?
No - hormonal signals complex
Rate of change in girls physical changes
Fully process can range from 2 to 9 years
Internal changes in girls during puberty
- Uterus grows
- Vagina lengthens
- Hips develop a cushion of fat
- Vocal cord longer
- Heart gets bigger
- Red blood cells carry more oxygen
- Stimulate ovaries to produce eggs
External changes in girls
- Breasts grow
- Hips Widened
- Body hair grows
- Taller
After puberty girls become
more stronger
Health-care workers track the growth of the penis, testicles, and pubic hair by
5 Tanner Stages
Why do boys look like children to the outside world for a year or two after body change
organs of reproduction begin developing first
After growth of the testes and penis
- Voice deepens
- Develops body hair
Growth spurt in boys during puberty
average of 8 inches compared to 4 for girls
Why are boys stronger than girls
- The tremendous increase in muscle mass
- Dramatic cardiovascular changes
- Heart increase in weight by more than 1/3rd
- More red blood cells
- Greater capacity for carrying oxygen in their blood
External physical changes in boys
- Big chest
- Wide shoulders
- Muscular frame
After puberty males
boost in gross motor skills that give them
Boys body growth pattern
from feet upward and from out of the body to middle
Boys Crackyl voice produces by
growing larynx
Why do boys have more acne?
- Increased activity of sweat gland
- Increased enlarged pores
- Increased testosterone
Gonads
The sex organs
the ovaries in girls and the testes in boys
Boys appear to reach puberty
two years later than girls
They don’t really - girls external develop first and boys internally develop first
The real sign of fertility shows boys hit puberty
Puberty hits at 13 about 6 months later than the average age of menarche
Sex differences in puberty timetables can cause
anxiety
Culture and puberty timetables
- Asian Americans = slightly behind others
- African Africans & Hispanics = ahead
What predicts entering puberty earlier for girls
- Having a high BMI during elementary school
- Rapid weight gain in first 9 months of life
- More apt to grow up in a mother-headed household
- Report intense childhood stress
- Mothers’ use of power-assertive discipline during preschool
- Prenatal material stress
What predicts entering puberty earlier for boys
Nothing
Evolutionary Psychology perspective of when family stress is intense
physiological mechanism kicks into acerbate puberty
Unhappy childhood signals the body to expect short life and pushes adult fertility to younger age
Most important force predicting child’s puberty timetable
genetics
Girls in the middle of puberty told most negative stories about
fathers - show body embarrassment at height while child undergoes physical changes.
Children’s reactions to puberty depend on
messages from the wider world
People with upper-middle-class mothers and menstruation
describe getting period as no big deal
People with low-income women and menstruation
describe getting period as feeling “gross, smelly, and disgusting”
Who is trying to change the cultural script to menstruation
Upper-middle-class mothers
When it comes to spermarche boys need to be
secretive
Children typically view their changing bodies as
embarrassing around the parent of the other sex
Early maturing boys are more prone to
- Negatives:
- abuse substances especially are teen prone to impulse control
- Depression if prior personality problems or unhappy family life
- Positives:
- Boosts popularity
- Boosts self-esteem
Maturing Early Can Be a
Problem for Girls
Early-Maturing Girls Are At Risk of
- Developing Externalizing Problems
- Getting Anxious and Depressed
Early-maturing girls gravitate toward
older girls and boy friend groups
- Get involved in “adult activities” at younger ages
- Worse grades
Early-maturing girls in their 20s
serval times less likely to graduate from high-school
The main danger of early-maturing girls
- Unprotected sex
- teen pregnancy
More likely to experience low self-worth
Early-maturing girls
In 4th or 5th grade =risk of being bullied by looks
Early maturing girls size
heavier during elementary, shorter, and stockier
- Poor body image
- Depressed
Late-maturing girls body shape
tall ultra-slim model shape
What saves early maturating girls body image better
when in ethnic groups that have a:
- healthier
- more inclusive ideas about the female body
Sexual Double Standard
A cultural code that gives men greater sexual freedom than women. Specifically, society expects males to want to have intercourse and expects females to remain virgins until they marry and to be more interested in relationships than in having sex.
Strutted highly protective community can
cushion girl from acting on behavioral message her body gives off.
Early-maturing girls and school
special problems after moving to a large middle school
Thin Ideal
The media-driven cultural idea is that females need to be abnormally thin.
Children’s reactions to puberty depend on
the environment in which they physically mature
With daily-maturing girls we should
take social steps to arrange the right body-environment fit
Communication about puberty should be
improved
especially for boys
Developmentalists urge parents to
discuss what is happening with a same-sex child
Parents of early-maturing daughters should
try to get the child involved in positive activities
Importance of schools on puberty
- Provide adequate puberty education
- Carings schools are vital to setting young teens on the right path
Pros and cons of UNESCO global guidelines
- Pro:
- Aimed at teaching young children to respect bodies
- Cons:
- not often used - focus on pubertal damage control
Susan Harter explored
how feeling competent in each of her five “self-worth” dimensions related to teens overall self-esteem
Susan Harter findings
being happy about one’s looks outweighs anything else in determining adolescents generally felt good about themselves. (Not true of US teens)