1. U NDERSTANDING YOUTH Physical, social, emotional and intellectual characteristics of development during the lifespan of youth

2. Y OUTH Youth is a term used to refer to young people. In the health and human development study design and in this textbook, youth or adolescence is considered to be the period of the human lifespan between the ages of 12 and 18 years.

3. Y OUTH However, definitions of ‘youth’ vary: the United Nations defines youth as people aged between 15 and 24 years; when reporting on Australian youth, the Australian Institute of Health and Welfare includes data for people aged between 12 and 24 years.

4. Y OUTH DEVELOPMENT Many changes occur during youth Adolescents in this stage of the lifespan are becoming more independent, developing physically, gaining social confidence, facing emotional challenges and advancing intellectually.

5. Y OUTH DEVELOPMENT These changes are known as the physical, social, emotional and intellectual characteristics of development, and they are influenced by behavioural factors, the physical environment in which a person lives, and the person’s social environment: their family and community.

6. P HYSICAL CHARACTERISTICS OF DEVELOPMENT Physical development during youth is rapid. During youth, the physical characteristics that change and develop include the size of the bones and muscles. Different parts of the body grow at different rates, the physical changes that occur to the head x2, arms x4, trunk x3 and legs x5 from birth to adulthood. By the end of the youth stage of the lifespan, people will have taken on adult body proportions. Changes to height and weight will be obvious and there will be other visible signs that a child has transitioned into a young adult.

7. PHYSICAL DEVELOPMENT PUBERTY: PUBERTY: Stage in which the human body sexually matures, a necessary step in order for reproduction to take place. PRIMARY SEXUAL CHARACTERISTICS: PRIMARY SEXUAL CHARACTERISTICS: Growth and development of parts of the body that result in the production of ova and sperm; namely ovaries and testes (genitals) SECONDARY SEXUAL CHARACTERISTICS: SECONDARY SEXUAL CHARACTERISTICS: outward physical changes that occur during puberty and characterise a person’s sex, including breast development, body hair and defining body shapes

8. FURTHER INFORMATION PUBERTY: PUBERTY: Triggered by the release of hormones in the pituitary gland in the brain. Timing varies considerably among individuals and ends when the ability to reproduce is achieved. PRIMARY SEXUAL CHARACTERISTICS: PRIMARY SEXUAL CHARACTERISTICS: Although present at birth, these organs only develop and become fully functional during puberty SECONDARY SEXUAL CHARACTERISTICS: SECONDARY SEXUAL CHARACTERISTICS: Not directly related to reproduction and are not present at birth

9. BONES, MUSCLES & ADIPOSE TISSUE BONES: BONES: grow and develop rapidly. Feet and hands enlarge first, followed by lengthening of calves and forearms, then thighs and upper arms, and lastly the bones in hips, chest & shoulders. MUSCLE: MUSCLE: rapid increase in development of muscle tissue in both sexes. Hormonal differences account for boys having greater muscular strength and motor capacity than girls. As muscles increase in strength, the body’s flexibility decreases – females more agile, better coordinated & more graceful ADIPOSE TISSUE: ADIPOSE TISSUE: in girls, this increases around the arms, legs and trunk. Due to hormonal differences, boys usually decrease arm and leg fat during puberty

10. RATE OF GROWTH WHAT IS THIS GRAPH TELLING US?

11. TIMING OF PUBERTY

12. FACTORS INFLUENCING PUBERTY Females mature at an earlier age than males Short and stocky youth will generally mature earlier than those of a tall and lean build Obesity or excessive thinness may delay the onset of puberty Environmental factors such as stress levels, socioeconomics status, nutritional intake, exercise and the presence or absence of chronic illness

13. S EXUAL DEVELOPMENT On average, females begin physical development approximately two and a half years before males. It is quite normal for some of these changes to begin during childhood for females. The peak growth spurt usually begins approximately two years later in males than in females, and males finish physical development after females.

14. S EXUAL DEVELOPMENT The timing of these physical changes is influenced by a number of factors, including genes, hormonal secretion patterns, ethnic background and nutrition. Adolescents now go through puberty at a younger age than they did a century ago. Good nutrition, improved health and better living conditions have been some of the reasons put forward to account for puberty beginning earlier.

15. P RIMARY AND SECONDARY SEXUAL CHARACTERISTICS Primary sexual characteristics are the physical sexual organs Secondary sexual characteristics distinguish males from females and indicate a level of physical maturation; however, they are not directly linked with a person’s capacity to reproduce

16. P RIMARY AND SECONDARY SEXUAL CHARACTERISTICS PRIMARY SEXUAL CHARACTERISTICS SECONDARY SEXUAL CHARACTERISTICS FEMALES Cervix Fallopian tubes Ovaries Uterus Vagina Enlargement of the breasts Growth of underarm and pubic body hair Widening of the hips Depositing of fat, mainly around buttocks, thighs and hips MALES Penis Prostate Testicles Scrotum Growth of body hair, including underarm, chest, abdomen, facial and pubic hair Increase in muscle mass Deepening of the voice Broadening of the shoulders

17. O NE SECONDARY SEXUAL CHARACTERISTIC IS THE GROWTH OF BODY HAIR.

18. T HE MALE REPRODUCTIVE SYSTEM IS A PRIMARY SEXUAL CHARACTERISTIC IN MALES.

19. T HE FEMALE REPRODUCTIVE SYSTEM IS A PRIMARY SEXUAL CHARACTERISTIC IN FEMALES.

21. M ENSTRUAL CYCLE A significant physical change that females undergo is the commencement of their menstrual cycle, otherwise known as menarche. This change signifies a female’s ability to bear children, and it usually occurs between the ages of 11 and 14 years; some females, however, may experience menarche as early as 8 years while others may not do so until the age of 15 or 16 years. Overall health levels, heredity and diet are reasons menarche can begin early or be delayed

22. M ENSTRUAL CYCLE An average menstrual cycle lasts approximately 28 days. This is an average, and individual menstrual cycles vary; in one month a cycle may be 28 days while the next few cycles may be shorter or longer. The menstrual cycle is controlled by a group of hormones.

23. M ENSTRUAL CYCLE

24. On day 1 of the cycle, which is when bleeding commences, follicle-stimulating hormone is released by the pituitary gland, which is a gland found at the base of the brain. Follicle-stimulating hormone acts on the ovaries to cause the follicles to begin maturing. Ovarian follicles are small sacs that contain an immature egg or ovum as it develops. Usually only one follicle matures and the others die off.

25. M ENSTRUAL CYCLE As the ovarian follicles begin to mature, the hormone oestrogen is released. While the follicles are maturing, the lining of the uterus ( endometrium) begins to thicken, in preparation for a possible pregnancy. On approximately day 14 of a 28-day cycle, an egg that has been maturing will be released from its follicle sac and launched from one of the ovaries into one of the fallopian tubes. Luteinising hormone is responsible for this process, which is known as ovulation.

26. M ENSTRUAL CYCLE

28. Following ovulation, the corpus luteum (discarded follicle) triggers the hormones oestrogen and progesterone to be released; these two hormones assist in building up the endometrium.

29. M ENSTRUAL CYCLE After ovulation, the egg travels along the fallopian tube, where it may or may not be fertilised by sperm. If fertilisation does not occur, the egg will continue its journey down the fallopian tube into the uterus, and it will be discarded along with the blood and tissue of the endometrium as part of the menstrual bleed.

30. M ENSTRUAL CYCLE The menstrual bleed lasts, on average, between 4 and 7 days. At the end of the menstrual cycle, hormone levels drop, and the next menstrual cycle begins on day 28. Go to web site http://kidshealth.org/parent/general/body_basics/f emale_reproductive_system.html?tracking=P_Rel atedArticle http://kidshealth.org/parent/general/body_basics/f emale_reproductive_system.html?tracking=P_Rel atedArticle If the egg is fertilised, the fertilised egg travels from the fallopian tubes into the uterus. Pregnancy occurs once the fertilised egg successfully implants in the endometrium.

31. EMOTIONAL DEVELOPMENT SELF-CONCEPT (who am I?) SELF-CONCEPT (who am I?) – evolves through interactions with others. Messages of acceptance, friendship, love and approval from significant others (family, friends, teachers) can influence development of positive self- concept SELF-ESTEEM (do I like myself?) SELF-ESTEEM (do I like myself?) - gives individuals the confidence to believe in themselves and their actions. Helps motivate youth to tackle new challenges SELF-CONSCIOUS (am I normal?) SELF-CONSCIOUS (am I normal?) – explore strategies or consult with friends in order to deal with these emotions effectively EMOTIONAL INDEPENDENCE EMOTIONAL INDEPENDENCE – mind changes so try to solve own problems rather than consult with parents, therefore take more responsibility for actions and provide ways to accept emotions NEW EMOTIONS NEW EMOTIONS – nature of relationships change: love and lust

32. INTELLECTUAL DEVELOPMENT Think and reason in more complex ways (think about more than one thing at a time) Use elaborate memory strategies Ignore information irrelevant to a situation Think about ideas in the abstract Think about the future Think about possible consequences of actions Expand vocabulary to 30,000 words Speak in longer sentences Communicate fluently with others

33. INDEPENDENCE Following a certain stage of maturing, a person is considered to have developed sufficient reasoning skills to make sound decisions, accept the consequences of their actions, and be self-directed There is a lot of trial and error – youth learn from their experiences Require support from others