GCSE Biology

• Oral contraceptives have a direct effect on the maturation of ova.
• Fertility issues in people with a uterus can be caused by low levels of FSH, which is responsible for eggs in the ovary maturing. Luteinising hormone (LH), which is responsible for the release of the egg, can also cause fertility issues.
• In IVF, eggs are fertilised outside of the mothers body.
• The ball of cells that grows from a fertilised egg is known as an embryo or zygote.
• Oestrogen is responsible for the development of secondary sexual characteristics in girls during puberty.
• Testosterone is responsible for bringing about the secondary sexual characteristics in boys during puberty.
• There are two method of natural contraception: abstinence, and the rhythm method.
• Surgical methods of birth control include:

  • Vasectomy
  • Sterilisation
  • Tubal ligation
• Puberty is the development of secondary sexual characteristics in teenagers.