Todays objectives You should learn about: What happens during ovulation, fertilisation and implantation 1 ofof20 13 31 Boardworks Ltd 2005
2004 Homework Worksheet on Atomic structure Learn definitions of fertilisation, implantation, fertile period and ovulation 1 ofof20 14 31
Boardworks Ltd 2005 2004 Male sex cells In males, the sex cells are called sperm. They are made in the testes 1 ofof20 15 31 Boardworks Ltd 2005
2004 Female sex cells In females, the sex cells are called eggs. They are made in the ovary. nucleus containing chromosomes An egg is so big that this is how small a sperm looks next to it. 1 ofof20 16
2004 Ovulation and fertilization In the female, one of the ovaries releases an egg every 28 days. This is called ovulation. During sexual intercourse millions of sperm are ejaculated into the vagina. If a sperm meets the egg a zygote is formed. This called fertilization. 1 ofof20 18
What happens after fertilisation? Once the zygote is made the cells divide many times It is now called an embryo and it will sink into the lining of the uterus, this is called implantation. 1 ofof20 22 31
Boardworks Ltd 2005 2004 The placenta How does an embryo get food and oxygen and how does it get rid of waste? A placenta is formed which allows it to exchange material with the mother The umbilical cord joins the embryo to the placenta. 1 ofof20
Boardworks Ltd 2005 2004 What happens in the placenta? In the placenta, food and diffuse from the mothers blood into the blood of the fetus. Carbon dioxide and waste products diffuse from the blood of the fetus to the mothers blood.
1 ofof20 25 31 Boardworks Ltd 2005 2004 From embryo to fetus After the first eight weeks of pregnancy, a human embryo is then called a fetus. The fetus continues to develop and grow inside its mothers uterus for a total of
40 weeks. What happens next? 1 ofof20 26 31 Boardworks Ltd 2005 2004 From embryo to fetus animation
1 ofof20 27 31 Boardworks Ltd 2005 2004 From embryo to fetus activity 1 ofof20 28 31
Boardworks Ltd 2005 2004 Glossary egg - The female sex cell. embryo - The first two months of development of a baby. fertilization - When the egg and sperm nuclei fuse. menstruation - The monthly cycle in females. ovary - The part of the female reproductive system that produces eggs. ovulation - The release of an eggs from the ovary. placenta - The structure made by an embryo to obtain
food and oxygen from its mother. puberty - The time when sex organs begin to work. sperm - The male sex cell. testis - The part of the male reproductive system that produces sperm. 1 ofof20 36 31 Boardworks Ltd 2005 2004
In this version of the Bwidget the default -entrybg for spinbox comboBox... is gray, while in earlier bversions it is white. When upgrading to the newest version TCL 184.108.40.206, TCL 220.127.116.11 we found that all of our application GUIs are...
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