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

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

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

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.

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

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

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

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

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

Oviduct 輸卵管 卵巢 子宮 子宮頸 膀胱 尿道

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.

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

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.

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.

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

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.

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.