7B Reproduction - Science at St. Dominics

7B Reproduction - Science at St. Dominics

Biology Human Reproduction 1 of 31 20 Boardworks Ltd 2005 2004 The male reproductive system

1 of 31 20 2 Boardworks Ltd 2005 2004 The female reproductive system 1 of 31 20 3

Boardworks Ltd 2005 2004 Male or female? 1 of 31 20 4 Boardworks Ltd 2005 2004

Reproductive system 1 of 31 20 5 Boardworks Ltd 2005 2004 Label the parts.

1 of 31 20 6 Boardworks Ltd 2005 2004 Label the parts 1 of 31 20 7

Boardworks Ltd 2005 2004 The menstrual cycle 1 of 31 20 8 Boardworks Ltd 2005 2004

The menstrual cycle The menstrual cycle is when the body prepares the uterus lining so that it is able to receive a fertilized egg. 1 of 31 20 9 Boardworks Ltd 2005 2004

The fertile period This is the time in the cycle when the woman could get pregnant after having sex. Between days 11 and days 16 of the menstrual cycle 1 ofof20 10 31

Boardworks Ltd 2005 2004 Label the parts 1 ofof20 11 31 Boardworks Ltd 2005 2004

Contents 7B Reproduction Ovulation, fertilization and implantation 1 ofof20 12 31 Boardworks Ltd 2005 2004

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

31 Boardworks Ltd 2005 2004 Sperm or egg? 1 ofof20 17 31 Boardworks Ltd 2005

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

31 Boardworks Ltd 2005 2004 Fertilization and implantation 1 ofof20 19 31 Boardworks Ltd 2005

2004 Word check reproduction processes 1 ofof20 20 31 Boardworks Ltd 2005 2004 Contents

Reproduction Embryo development 1 ofof20 21 31 Boardworks Ltd 2005 2004

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

23 31 Boardworks Ltd 2005 2004 The placenta 1 ofof20 24 31

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 Birth animation 1 ofof20 29 31 Boardworks Ltd 2005 2004

What is puberty? Puberty is the stage between the ages of 10 18 when the sex organs of humans become active Think about What happens to i) boys and ii) girls during puberty? 1 ofof20 30 31

Boardworks Ltd 2005 2004 Puberty in girls 1 ofof20 31 31 Boardworks Ltd 2005 2004

Puberty in boys 1 ofof20 32 31 Boardworks Ltd 2005 2004 Contraception Contraception is the steps we take to reduce the chance

of getting pregnant or giving birth Should contraception be allowed in Ireland? 1 ofof20 33 31 Boardworks Ltd 2005 2004

1 ofof20 34 31 Boardworks Ltd 2005 2004 1 ofof20 35 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

Anagrams 1 ofof20 37 31 Boardworks Ltd 2005 2004 Multiple-choice quiz 1 ofof20

38 31 Boardworks Ltd 2005 2004

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