Natural Sciences Grade 7 Term 1 Life and
- Slides: 9
Natural Sciences Grade 7 Term 1: Life and Living Sexual Reproduction in Humans (Part 1) (PPT 5)
Topic 3 Sexual Reproduction The Human Life Cycle Natural Sciences – Grade 7
The purpose of sexual reproduction • Sexual reproduction allows humans to reproduce (have a baby). • This means, the male sex cells need to find and join the female sex cell. • Fertilisation happens when these two cells join together. • Human male sex cells are called sperms. • Human female sex cells are called eggs. Natural Sciences - Grade 7
Male and female sex cell join to develop into a baby Natural Sciences - Grade 7
The Human Life Cycle Natural Sciences - Grade 7
Puberty • Humans are born with reproductive organs. • Our reproductive organs develop when we are between 9 and 18 years old. • This period is called adolescence. • Puberty is the first part of adolescence when most changes happen in our bodies: o In girls, puberty starts between ages 7 and 13. o In boys, puberty starts between ages 9 and 15. Natural Sciences - Grade 7
Puberty • This is when your body changes from a child to an adult. • The process is controlled by hormones. • Hormones are produced by glands such as the pituitary gland in your brain. • Humans go through different changes: v Physical = the way we look v Emotional = the way we feel v Psychological = the way we think Natural Sciences - Grade 7
Puberty • You start becoming interested in the opposite sex. • It is natural to feel this way. • This does not mean that you must have sex. • You can learn to control your thoughts and feelings. • This means that you must act responsibly. Natural Sciences - Grade 7
Puberty and changes to the sex organs • Many of the physical changes during puberty happen inside the body where we cannot see them. • Other changes happen to the sex organs. • Boys sometimes refer to their private part as a winky or a toti or other names. But the proper word is a penis. • Girls sometimes call their private part a flower or other name, but the proper word is a vagina. Natural Sciences - Grade 7
