human reproduction

Human Reproducti

on

adolescence

BOYS GIRLS

Testes start to produce sperm Ovaries start to release eggs

Testes start to produce androgens(testosterone)

Ovaries start to produce estrogen and progesterone

Hair grows on the face, chest and armpits

Menstruation starts

Voice deepens Breast get larger

Behaviour changes Behaviour changes

Pubic hair grows Pubic hair grows

Three Primary Hormones of Sexual

Development •Estrogen

•Progesterone

•Testosterone 0

20

40

60

80

100

120

140

Men Women

E

P

T

Male anatomy

Male gametes

• Male gametes, very large numbers

• 100 million sperm per ejaculation

• smaller

• Motile (if they can propel themselves, mobile if they can be easily moved)

Female anatomy

Female gametes• Female gametes (ova or eggs in animals, ovules in plants)

• Fairly small numbers.

• Human females for example release about 500 ova in a lifetime.

• Larger

• Stationary

• They often contain food reserves (lipids, proteins, carbohydrates) to nourish the embryo after fertilisation

Basic lifecycle of sexually

reproducing organisms

Meiosis

Hormones

Levels of hormones

The changing levels of the female sex hormones controlthe different stages of the menstrual cycle

Having a baby

Fertilisation

Fertilisation

Pregnancy