Physical Changes at Puberty What is puberty Why

Physical Changes at Puberty What is puberty 青春期？ Why most of the girls are taller than the boys?

Physical Changes at Puberty 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. Babyhood Childhood 嬰兒期 兒童期 0 -1 2 -10 Puberty 青春期 11 -19 Adulthood Old age 老年期 成年期 20 -59 60 or above Puberty is the stage when a child grows into an adult. Young people reach and complete puberty at slightly different times and rates.

Physical Changes at 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 Body hair may appear on chest 胸毛 Shoulders widen Wet dream夢 遺 may occur Height and weight increase rapidly Pimples暗瘡 may occur Underarm腋 毛and pubic hair恥毛 appears Reproductive organs mature生殖器 官成熟 Breasts 乳房 develop 隆起 Hip widen 腎部較寬 Menstruation月經 starts

Physical Changes at Puberty 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.

Physical Changes at Puberty 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 Testis 睪丸 Scrotum 陰囊 Which organ produces sperms 精子and secretes 分泌male hormones荷爾蒙? Testes 睪丸

Physical Changes at Puberty

Physical Changes at Puberty

Physical Changes at Puberty

Physical Changes at Puberty

Physical Changes at Puberty

Physical Changes at Puberty

Physical Changes at Puberty

Physical Changes at Puberty

Physical Changes at Puberty 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

Physical Changes at Puberty 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 wet dreams夢遺 sleeping. These are called _________.

Physical Changes at Puberty Female reproductive system and menstruation What are the major reproductive organs生殖器官in females? Oviduct 輸卵管 Ovary 卵巢 Uterus 子宮 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

Physical Changes at Puberty Oviduct 輸卵管 卵巢 子宮 子宮頸 膀胱 尿道

Physical Changes at Puberty

Physical Changes at Puberty 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.

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

Physical Changes at Puberty 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.

Physical Changes at Puberty 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.

Physical Changes at Puberty 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, menstruation月經 ____________ starts.

Physical Changes at Puberty 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.

Physical Changes at Puberty

Physical Changes at 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.

Physical Changes at Puberty

Physical Changes at Puberty