Learn Class 8 Science - Reproduction and Endocrine System

The reproduction and endocrine system chapter discusses all the stages of life. Like what happens when the body gets matured?

Meaning of Adolescence:

Adolescence is the period of life transition when the body suffers many changes, leading to reproductive maturity.

• WHO defines the adolescence period.
• And this period lies between 11-19 years old.
• The human body suffers from many changes.
• Such changes lead to the action of puberty.

What is puberty?

We can say that puberty is a phase:

• When the reproductive organs work actively.
• The stage gets ended when the adolescent attains maturity.

What are the changes during puberty?

Many changes happen at the time of puberty. LIKE:

• Voice get change
• Height get change
• Emotional aspects
• Mental development
• Body shape get change

Hormones:

1. Male hormones: Hormones in males are known as 'testosterone.'
2. Female hormones: Hormones for females are known as 'estrogen.'

Zygote:

The zygote is formed with both sperm and fuse. Well, the sex chromosomes of sperm help in doing the determination of the kids' gender.

• There are 23 chromosomes in a human cell.
• Chromosomes pair form 'sex chromosomes.'
• Male chromosomes: XY
• Female chromosomes: XX