September 2016

Contraception: Male or Female condoms

By |2022-09-15T12:37:52+02:00September 2nd, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

couple_smiling-min

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

Images credit netdoctor.co.uk
  • The male condom is used to sheath(cover) an erect penis just before sex
  • The female condom is […]

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Injection (Depo Provera)

By |2022-09-15T12:37:53+02:00September 2nd, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit star.ng

Image credit star.ng ZIMSEC O Level Combined Science Notes:Contraception:Injection (Depo Provera)
  • Also simply known as Depo
  • It is an injection containing medroxyprogesterone, a contraceptive injection for women that contains the hormone progestin

How it works Depo provera

Depo provera injection
  • Prevents the […]

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Contraception: The pill

By |2022-09-15T12:37:53+02:00September 2nd, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit citifmonline.com

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 […]

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Rhythm/Natural Family Planning

By |2022-09-15T12:37:53+02:00September 2nd, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit atlantablackstar.com

Image credit atlantablackstar.com ZIMSEC O Level Combined Science Notes:Contraception:Rhythm/Natural Family Planning

How it works

  • Various techniques are used:
  • Learn to recognise the fertile periods in the menstrual cycle and avoid sex during that period
  • Several techniques are used to identify this fertile period:
    1. The temperature method is when […]

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August 2016

Pregnancy

By |2022-09-15T12:37:54+02:00August 24th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Pregnancy

  • The vagina receives an erect penis during sexual intercourse
  • During sexual intercourse, sperms are ejaculated into the vagina
  • There they begin to swim up to the oviducts
  • If an ovum is released at this time it may be fertilised in the oviduct
  • Although many sperms reach the ovum only one will […]

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The menstrual cycle

By |2022-09-15T12:37:54+02:00August 18th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit lifestylechallenge.deborahgabriel.com

Image credit lifestylechallenge.deborahgabriel.com ZIMSEC O Level Combined Science Notes: The menstrual cycle
  • The reproductive cycle in females is called the menstrual/estrus cycle
  • It has an average of 28 days
  • It varies from individual to individual but it follows a set pattern
  • The cycle is regulated by hormones produced […]

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Female Reproductive system

By |2022-09-15T12:37:55+02:00August 18th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit huffpost.com

Image credit huffpost.com ZIMSEC O Level Combined Science Notes: Female Reproductive system
  • The diagram below shows the reproductive system of a female

Female reproductive system

Female reproductive system
  • Ovaries-there are two ovaries
    • Their function is to produce and release ova […]

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Male Reproductive system

By |2022-09-15T12:37:55+02:00August 18th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit raanetwork.org

Image credit raanetwork.org ZIMSEC O Level Combined Science Notes: Male Reproductive system
  • The diagram below shows the reproductive system of a man

Male reproductive system. Image credit goldiesroom.org

Male reproductive system. Image credit goldiesroom.org
  • Testes-this is where sperms are made.
      […]

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Reproduction in Humans

By |2022-09-15T12:37:56+02:00August 18th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

A Zimbabwean family

A Zimbabwean family ZIMSEC O Level Combined Science Notes: Reproduction in Humans
  • Human being produce sexually
  • The process involves the fusion (joining) of the nuclei (sex cells) of the male gamete (sperm)
  • and the female gamete (ovum)
  • To form a zygote
  • The human and female sexual organs take […]

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