1. What is puberty 青春期？
Why most of the girls are taller than the boys?

2. What is puberty 青春期？
A healthy person experiences these growing stages成長階段 at different times in his or her life.
During puberty, our body grows rapidly and shows obvious明顯 changes. Puberty usually takes place earlier in girls than in boys.
Old age
老年期
Babyhood
嬰兒期
Childhood兒童期
Puberty
青春期
Adulthood
成年期
0-1
2-10
11-19
20-59
60 or above
is the stage when a child grows into an adult. Young people
reach and complete puberty at slightly different times and rates.
Puberty

3. Changes in the body
What are the physical changes in boys and girls during puberty?
Larynx enlarges and voice deepens長出喉結，聲調變得低沈
Height and weight increase rapidly
Breasts 乳房develop 隆起
Hip widen腎部較寬
Pimples暗瘡may occur
Body hair may appear on chest 胸毛
Underarm腋毛and pubic hair恥毛appears
Shoulders widen
Menstruation月經 starts
Reproductive organs mature生殖器官成熟
Wet dream夢遺 may occur

4. What advice would you give
Jane and Tom?
Adopt a positive attitude
towards the normal changes.
During puberty, our body grows rapidly and shows
obvious changes.

5. Male reproductive system and wet dreams
What are the major reproductive organs生殖器官in males？
Urethra 尿道
Sperm duct
輸精管
Penis陰莖
Scrotum 陰囊
Testis 睪丸
Which organ produces sperms 精子and secretes 分泌male hormones荷爾蒙?
Testes 睪丸

7. 輸尿管
前列腺
儲精囊
Sperm duct
輸精管 尿道
陰莖頭 陰囊 睪丸

15. It is semen 精液 ejaculated in a wet dream.
Tom wakes up to find a thick whitish fluid白色濃稠液體 in his underwear. What is it?
It is semen 精液 ejaculated in a wet dream.
I didn’t wet
my bed, did I?
Why does it happen?
The penis is stimulated 受刺激 which results in an erection and ejaculation. 射精

16. Wet dreams夢遺are normal for boys going through puberty.
They are harmless to the body.
Just remember to change into
some clean clothes afterwards.
During puberty, boys may ejaculate semen while they are
sleeping. These are called _________________.
wet dreams夢遺

17. Female reproductive system and menstruation
What are the major reproductive organs生殖器官in females?
Oviduct
輸卵管
Uterus 子宮
Ovary 卵巢
Vagina 陰道
What are the functions of the ovaries?
They release eggs排卵 and secrete female
hormones分泌女性賀爾蒙

18. Oviduct
輸卵管 卵巢 子宮
子宮頸 膀胱 尿道

20. What causes menstruation月經?
(1) The lining內膜of the uterus子宮thickens and prepares to receive a new egg.
The ovary releases a mature egg about every 28 days.

21. What causes menstruation月經?
(2) The ovary releases an egg.卵巢排出卵子

22. What causes menstruation月經?
The lining of the uterus thickens so that a fertilised egg can attach to it and develop a baby. 準備受精卵子孕育生長。
(3) The lining of the
uterus continues
to thicken.

23. What causes menstruation月經?
(4) The egg is not fertilised 受孕. The thickened lining of the uterus sheds脫落. (menstruation)
If an egg is not fertilised受精, the thick layer of tissue and blood cells that build up in the uterus will break off脫落and flow out 排出 through vagina.

24. Why do girls start menstruating after they have reached puberty?
為甚麼女孩子踏入青春期會有月經？
Their reproductive organs mature and their bodies are now capable of能夠reproduction.孕育下一代
When the female reproductive organs mature,
_______________________ starts.
menstruation月經

25. Know more about our body:
Which organ commands the physical changes in the body during puberty?
The brain. The pituitary gland 腦下垂體at the base of the brain secretes sex hormones to stimulates physical changes in our body during puberty.

27. Know more about our body:
Why male reproductive organs are found outside the body? Why female reproductive organs are found inside our body?
Because sperm production is highly sensitive towards temperature.
If it is too hot, it may affect sperm production. Therefore, the male reproductive organs are found outside the body.