sexual reproduction

Couple holding hands. Image credit neguswhoread.com ZIMSEC O Level Combined Science Notes:Contraception: Abstinence

• It involves total avoidance of sexual intercourse

Adavantages

• Many couples agree to wait until marriage
• There is no risk of contracting  Sexually Transmitted Infections
• It is 100% effective
• It is supported by most religious […]
  

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 […]
  

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

• Testes-this is where sperms are made.
  […]

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

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

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 […]