Page 77 - Science Course 2 (Book 1)

Mo3-L2a: What is Puberty?

Key Concept Female Reproduction
What is Puberty? Puberty in girls begins the production of Estrogen
and Progestogen.
What are changes in the body during puberty?
Estrogen helps the female reproductive system to
develop and causes physical changes in girls such
as height and female body development.

Fallopian Tube

Uterus
Ovary
Cervix

Male Reproduction Vagina
Puberty in boys begins the production of testosterone
and sperm. Progestogen mainly affects the uterus to prepare it
for pregnancy during the second half of the
Sperm cells must be produced for men to reproduce. menstrual cycle.
Progestogen thickens the uterus lining in preparation
for a fertilized egg to implant.

If fertilization does not occur, this lining breaks down
and is discharged as a menstrual bleed.

Testosterone is the hormone The Influence of Testosterone
that causes most of the
changes in a boy’s body and Skin Brain
male reproductive organs • Growth of Facial & • Sex Drive
during puberty. body hair • Positive Feelings
• Supports collagen • Aids cognition
Testosterone stimulates and memory
the development of male Male Sex Organs
characteristics by affecting • Sperm production Bone Marrow
a man’s appearance and • Prostate growth • Red blood cell
sexual development. • Erectile function production

It affects bone and muscle Muscle Bone
mass, the way men store • Muscle mass and • Bone density
fat in the body, and even red strength maintenance
blood cell production.

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