Page 75 - Science Course 2 (Book 1)

Human Reproductive System Mo3-L2a: What is Puberty?
Lesson 2

Testosterone
Male sex hormone
In this topic, you will learn the following that affects a man’s
lessons: appearance and
sexual development.
Mo.3-L2a: What is Puberty?

Let’s Begin

Mo3-L2a What is Puberty? Puberty

KEY CONCEPTS: Puberty is when a child begins to change into an
1. What are changes in the body during puberty? adult.
2. How is puberty related to the ability to reproduce?
During this time many changes happen to your body,
both physically and mentally.

Vocabulary A-Z

Let us learn some vocabulary

puberty
is when a child begins to change into an adult.
From an evolutionary perspective, puberty changes
your body to make you able to have children.

In girls this is about 8-14 years of age (average 11)
and lasts about 4 years.

• Whole body gets curvier
• Skin gets oilier
• Breasts starts to develop
• Hair under the arms
• Hip bones wider
• Pubic hairs
• Weight gain on hips
Estrogen • Leg muscle get bigger and stronger
Female sex hormone
which stimulates
female puberty and In boys puberty starts around 9-14 years but takes
controls a woman’s around 6 years to reach sexual maturity.
reproductive cycle.
• Skin gets oilier
• Shoulder get wider
• Hair under the arms
• Facial hair
• Pubic Hairs
Progestogen • Neck, chest and leg muscle get
Female sex hormone bigger and stronger
secreted by the ovary • Facial Hair
as part of the • Penis get longer and wider and
menstrual cycle. testes get larger.

68