Physical development in Adolescence

Present at birth and develop during puberty.

The testicles begin to produce spermatozoa, (sperm), and this is the beginning of ejackulati*n.

Spontaneous erections caused by blood flowing into chambers in the penis may happen.

Already has all of their eggs.

The uterus enlarges and the vagina lengthens for childbirth/ sexual activity.

The ovaries begin to release eggs.

Develop during puberty.

Changes in larynx, (Adam's apple), causing voice to deepen.

Hair grows in armpits, pubic area and facial hair.

Enlargement of penis and testes.

Redistribution of muscle tissue and fat.

Breasts develop and the areola, (the area around the n*pple), swells and darkens.

The Menstrual Cycle commences.

Redistribution of body fat causes hips to widen - hourglass figure.

Hair grows in armpits and pubic areas.

The role of the hormones in sexual maturity is...

The pituitary gland in the brain releases these hormones.

Sexual development in adolescence.

Master glands.

Testes produce testosterone which stimulates sperm production, indicating onset of fertility.

Testosterone is also responsible for the development of secondary sexual characterstics like...

• Deeper pitch of voice
• Deeper tone of voice

In adolescence, ovaries produce oestrogen and progesterone hormones.

They are responsible for changes including...

• Ovulation
• Menstruation - eggs released and ready for pregnancy

This is significant as it indicates the onset of fertility.