sexual reproduction

There are several major methods of contraception. Image credit relationshipplaybook.com ZIMSEC O Level Combined Science Notes:Contraception:Ways to prevent pregnancy

• Contraception-the deliberate use of artificial methods or other techniques to prevent pregnancy as a consequence of sexual intercourse
• Common methods of contraception […]
  

Image credit citifmonline.com ZIMSEC O Level Combined Science Notes:Contraception: The pill

• Are also known as birth control pills (BCPs) or
• Oral Contraceptive Pills (OCPs)

How it works

• They contain the two female hormones: oestrogen and progesterone
• They prevent the release of ova/female sex cells
• They cause growth of an […]
  

ZIMSEC O Level Combined Science Notes:Contraception: Male or Female condoms

• Are one of the most commonly used contraceptives

How it works Images credit netdoctor.co.uk

• The male condom is used to sheath(cover) an erect penis just before sex
• The female condom is […]
  

Couple having dinner. Image credit singleblackmale.org ZIMSEC O Level Combined Science Notes:Contraception:Ways to prevent pregnancy

• Spermicides are sperm killing chemicals

How it works

• Are usually in the form of jelly cream placed into the vagina before sexual intercourse
• The chemical kills spermatozoa

Effectiveness

• 60-95%

Advantages

• Does not require […]
  

Black couple. Image credit blackcouplegetaways.com ZIMSEC O Level Combined Science Notes:Contraception:Ways to prevent pregnancy

How it works

• Can be done in both men and women
• In men it is known as a vasectomy
  • Sperm duct is cut and tied
  • During sexual intercourse ejaculated fluid contains no sperm

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