Year 7 Biology Topic Reproduction

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  • 1. KS3 Biology 7B Reproduction1 of 20 31 © Boardworks Ltd 2004 2005
  • 2. Contents 7B Reproduction Human sex cells and systems Ovulation, fertilization and implantation Embryo development and birth Puberty Summary activities1 of 202 31 © Boardworks Ltd 2004 2005
  • 3. Human reproduction Reproduction is one of the seven life processes. All living things reproduce. Humans use sexual reproduction to produce their young. In order to do this, the two parents (male and female) have different reproductive systems and organs that produce different sex cells.1 of 203 31 © Boardworks Ltd 2004 2005
  • 4. The male reproductive system1 of 204 31 © Boardworks Ltd 2004 2005
  • 5. The female reproductive system1 of 205 31 © Boardworks Ltd 2004 2005
  • 6. Male or female?1 of 206 31 © Boardworks Ltd 2004 2005
  • 7. Reproductive system1 of 207 31 © Boardworks Ltd 2004 2005
  • 8. Sex cells – sperm In males, the sex cells are called sperm. Sperm are produced in sex organs called testes.1 of 208 31 © Boardworks Ltd 2004 2005
  • 9. Sex cells – egg In females, the sex cells are called eggs. Eggs are produced in sex organs called ovaries. nucleus containing cytoplasm chromosomes membrane jelly coat An egg is so big that this is how small a sperm looks next to it.1 of 209 31 © Boardworks Ltd 2004 2005
  • 10. Sperm or egg?1 of 2010 of 31 © Boardworks Ltd 2004 2005
  • 11. Contents 7B Reproduction Human sex cells and systems Ovulation, fertilization and implantation Embryo development and birth Puberty Summary activities1 of 2011 of 31 © Boardworks Ltd 2004 2005
  • 12. Ovulation and fertilization In the female, one of the ovaries produces 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, the sperm’s nucleus can join with the egg’s nucleus. This fusing of the nuclei is called fertilization.1 of 2012 of 31 © Boardworks Ltd 2004 2005
  • 13. Fertilization and implantation1 of 2013 of 31 © Boardworks Ltd 2004 2005
  • 14. Word check – reproduction processes1 of 2014 of 31 © Boardworks Ltd 2004 2005
  • 15. Contents 7B Reproduction Human sex cells and systems Ovulation, fertilization and implantation Embryo development and birth Puberty Summary activities1 of 2015 of 31 © Boardworks Ltd 2004 2005
  • 16. The placenta How does an embryo get food and oxygen and how does it get rid of waste? An embryo forms a plate-like structure called the placenta. The umbilical cord joins the fetus to the placenta. In the placenta, food and oxygen diffuse from the mother’s blood into the blood of the fetus. Carbon dioxide and waste products diffuse from the blood of the fetus to the mother’s blood.1 of 2016 of 31 © Boardworks Ltd 2004 2005
  • 17. The placenta1 of 2017 of 31 © Boardworks Ltd 2004 2005
  • 18. From embryo to fetus In the earliest stages of development, a human baby is called an embryo. After the first eight weeks of pregnancy, a human embryo is then called a fetus. At this stage the fetus has all the main human features. The fetus continues to develop and grow inside its mothers’ uterus for a total of 40 weeks. What happens next?1 of 2018 of 31 © Boardworks Ltd 2004 2005
  • 19. From embryo to fetus – animation1 of 2019 of 31 © Boardworks Ltd 2004 2005
  • 20. From embryo to fetus – activity1 of 2020 of 31 © Boardworks Ltd 2004 2005
  • 21. Birth animation1 of 2021 of 31 © Boardworks Ltd 2004 2005
  • 22. Contents 7B Reproduction Human sex cells and systems Ovulation, fertilization and implantation Embryo development and birth Puberty Summary activities1 of 2022 of 31 © Boardworks Ltd 2004 2005
  • 23. What is puberty? Human children are born with a complete set of sex organs. However, they do not become active until between the ages of 10 and 18. In males, the testes start to make sperm in boys and in females, the ovaries start to release eggs. This stage of development is called puberty. During this important period, many changes take place in the bodies of young men and women.1 of 2023 of 31 © Boardworks Ltd 2004 2005
  • 24. Puberty in girls1 of 2024 of 31 © Boardworks Ltd 2004 2005
  • 25. Puberty in boys1 of 2025 of 31 © Boardworks Ltd 2004 2005
  • 26. Menstruation An important part of puberty for girls is the beginning of their monthly cycle. This is known as the menstrual cycle. The menstrual cycle involves the preparation of the uterus lining so that it is able to receive a fertilized egg. If an egg is fertilized, it can implant itself in the prepared uterus lining. If it is not fertilized, the lining of the uterus breaks down and is lost from the body. This is called menstruation or a period.1 of 2026 of 31 © Boardworks Ltd 2004 2005
  • 27. The menstrual cycle1 of 2027 of 31 © Boardworks Ltd 2004 2005
  • 28. Contents 7B Reproduction Human sex cells and systems Ovulation, fertilization and implantation Embryo development and birth Puberty Summary activities1 of 2028 of 31 © Boardworks Ltd 2004 2005
  • 29. 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 of 2029 of 31 © Boardworks Ltd 2004 2005
  • 30. Anagrams1 of 2030 of 31 © Boardworks Ltd 2004 2005
  • 31. Multiple-choice quiz1 of 2031 of 31 © Boardworks Ltd 2004 2005