SEX EDUCATION Group Members : 1. Lee Wai Sarah ( ) 2. Leung Hau Ching Kitty ( ) 3. Siu Hau Yan Stella ( )

Where did you come from ? Do you know where did you come from? How could you come to the world? Many parents found it difficult and embarrass to answer all these questions when their children ask them. In the following, we would like to answer all these questions. Please pay attention since it is very important to all of you.

Reproductive Organs Before we talk about how do you come from, we should first introduce to you our reproductive organs, both male and female. It is quite different from each other and in the following, we will explain to you the structure of them and the functions of different parts.

Male Reproductive Organ The man reproductive organ basically consist of the testes, the epididymis, the vas deferens, and the penis. There are two testes, each of which is about the size and shape of a walnut. They contain a huge network of tiny tubes, within which sperm production occurs. Once sperm have been produced in the testis, they move on to the epididymis, which is another tube attached to the testis. Here they are ‘finishedoff’ and become able to swim.

Sperm From the epididymis, sperm move on into yet another tube, called the vas deferens.This tube carries them past the seminal vesicles and the prostate gland, both of which produce secretions, which may help to nourish the sperm, and make up much of the ejaculatory fluid or semen. When they reach the penis, the two tubes join up into one. The penis has two functions. The first is that of passing urine. The second, and of more interest in our project, is that it facilitate entry of sperm into vagina during sex. The penis becomes rigid and larger when a man is sexually aroused and ejaculation fluid may appear at its tip quite soon.

Female Reproductive Organ The majority of a woman’s reproductive organs are to be found in her pelvis: the womb (uterus), Fallopian tubes, ovaries, vagina and cervix. The ovaries produce eggs, which pass down to the womb through the Fallopian tubes. The egg is literally sucked into the open end of the tube by finger-like processes (called fimbriae). Once inside the tube, it is wafted down towards the womb by tiny little hairs called cilia. The womb itself is really nothing more than a box designed to hold a pregnancy. Meanwhile, the vagina and cervix provide a way for sperm to reach the womb and fertilize an egg, which might be waiting here.

Is sperm and egg related to our birth ? The answer is absolutely yes. It is because through sexual intercourse, the sperm and egg will fuse to form zygote. The sexual intercourse is the action that transfer sperm to egg, then if sperm and egg are fused successfully, fertilization takes place. The process of fertilization: Sperm from testis  penis (man’s sexual organ)  vagina (woman’s sexual organ)  fused with egg in oviduct.

Development of zygote §In the following, we would give you how the zygote develop in different stages.

6 weeks §Embryo was bathed in a fluid-filled cavity §Embryo was developed with a simple brain, spinal cord and Central Nervous System §There were four pits in the head which were developed into two eyes and two ears §Embryo started to have its own digestive system §Stomach and Chest became to develop §Blood vessels was being pumped through the umbilical cord and the whole embryo is in constant motion

7 weeks §Embryo had dark eyes that no more than pits in the skull §Embryo with arms, hands and legs that grow and develop from one day to the next

8 weeks §Embryo lies suspended in the amniotic fluid to protect its delicate organs and tissues against impacts and pressure

12 weeks §From the placenta, the embryo’s blood absorbs proteins, fat and glucose for the constant process of cell-building, as well as oxygen to fuel the process §The outer ear was well developed §Delicate fingers and toes are formed

16 weeks §The head was almost as large as its body §The embryo had its own finger-print §The neck was developed

20 weeks §The embryo could grasp its hands §The size of its legs was proportional to other parts of the body

24 weeks §The skin became thick §The face became small

28 weeks §The eyes became open §Hearing was well developed §The faces and the body was covered by vernix which prevent the loss of water

To Be Continued…... Please insert another disk to continue