contraception

• Human fertility is controlled by hormones, so fertility can be controlled using hormonal forms of contraception.
• oral contraceptives that contain hormones to inhibit FSH production so that no eggs mature
• injection, implant or skin patch of slow release progesterone to inhibit the maturation and release of eggs for a number of months or years
• barrier methods such as condoms and diaphragms which prevent the sperm reaching an egg
• intrauterine devices which prevent the implantation of an embryo or release a hormone
• spermicidal agents which kill or disable sperm
• abstaining from intercourse when an egg may be in the oviduct
• surgical methods of male and female sterilisation.
• In Vitro Fertilisation (IVF) treatment. ; IVF involves giving a mother FSH and LH to stimulate the maturation of several eggs. The eggs are collected from the mother and fertilised by sperm from the father in the laboratory. The fertilised eggs develop into embryos. At the stage when they are tiny balls of cells, one or two embryos are inserted into the mother's uterus (womb).
• Although fertility treatment gives a woman the chance to have a baby of her own: it is very emotionally and physically stressful , the success rates are not high . it can lead to multiple births which are a risk to both the babies and the mother.
• the advantages of using oral contraceptives as a method of contraception is that they do not need to be used at any particular time during sexual intercourse so there is no disruption to the sexual act.
• the disadvantage of using condoms as a method of contraception is that they must be used correctly every time sexual intercourse takes place.
• The main advantage of using condoms as a method of contraception is that they protect against sexually transmitted diseases such as HIV/AIDS.
• Sexual reproduction occurs between individuals with different sets of genes.
• Gametes are haploid sex cells that contain half the number of chromosomes found in body cells.
• The main advantage of using condoms as a method of contraception is that they protect against sexually transmitted diseases such as HIV/AIDS. They also do not affect breastfeeding or menstrual cycles.
• The disadvantage of using condoms as a method of contraception is that they must be used correctly every time sexual intercourse takes place. If they break during use then there is no protection against pregnancy or STDs.
• The advantages of using oral contraceptives as a method of contraception include their effectiveness at preventing pregnancy if taken correctly. They also do not affect breastfeeding or menstrual cycles.