Download - Human Reproduction
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Human Reproducti
on
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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
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Three Primary Hormones of Sexual
Development •Estrogen
•Progesterone
•Testosterone 0
20
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60
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Men Women
E
P
T
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Male anatomy
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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)
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Female anatomy
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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
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Basic lifecycle of sexually
reproducing organisms
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Meiosis
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Hormones
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Levels of hormones
The changing levels of the female sex hormones controlthe different stages of the menstrual cycle
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Having a baby
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Fertilisation
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Fertilisation
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Pregnancy