human reproduction
DESCRIPTION
Human reproduction; anatomy, cells, hormones, pregnancy.TRANSCRIPT
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