Development/fertilization

• What happens after sexual intercourse to produce a baby?

  The egg is fertilized and develops in the uterus
• How often is an egg released from the ovaries?

  Once a month
• What helps move the egg along the fallopian tube?

  Tiny hairs called cilia
• What is released during sexual intercourse?

  Millions of sperm
• Where do sperm swim after entering the vagina?

  Through the cervix into the uterus
• Why do some sperm enter the wrong fallopian tube?

  Only one egg is released from one ovary
• What happens during fertilization?

  The nuclei of sperm and egg fuse
• What does the nucleus contain?

  Genetic information
• What moves the fertilized cell to the uterus?

  Ciliated cells
• What is the term for the fertilized cell attaching to the uterus wall?

  Implantation
• What happens to the fertilized cell after implantation?

  It divides to produce a baby
• What do some of the cells produced from division become?

  The placenta
• What connects the fetus to the placenta?

  The umbilical cord
• How does the fetus receive nutrients?

  From the mother's blood via the placenta
• What is a risk associated with the placenta connection?

  Chemicals can pass from mother to baby
• Why are mothers advised against certain foods during pregnancy?

  To prevent harmful substances reaching the baby
• How long does the baby develop inside the mother?

  40 weeks
• What surrounds the baby during development?

  Amniotic fluid
• What happens during birth to the cervix?

  It relaxes and widens
• What helps push the baby through the vagina during birth?

  Muscles in the uterus wall contract
• What happens to the umbilical cord after birth?

  It is cut
• What is expelled after the baby during birth?

  The placenta
• What are the main stages of human development after fertilization?

  1. Fertilization: sperm and egg nuclei fuse
  2. Implantation: fertilized cell attaches to uterus
  3. Cell division: produces baby and placenta
  4. Development: fetus grows in amniotic fluid
  5. Birth: baby is delivered through the vagina
• What are the risks associated with pregnancy regarding maternal habits?

  • Chemicals can pass to the baby
  • Viruses can affect fetal development
  • Drugs can harm the baby
  • Certain foods may be unsafe