sexual reproduction

PUBERTY

Changes in female

• breasts develop, nipples swell
• hips widen
• body gets curvier
• gets growth spurt before boys
• menstruation starts (first menstruation = menarche)
• uterus enlarges

CHANGES IN MALE

• shoulders widen
• facial hair develops
• breasts develop slightly
• muscles get bigger and stronger
• penis gets longer and wider
• testes enlarges
• gets erections
• adams apple gets more prominent

Changes in both sexes

• acne for some
• growth spurt
• gain weight
• armpit hair growth
• pubic hair growth
• emotional changes

reproduction

female gametes

• size: diameter = 120 micrometers
• number: 1
• motility: non-motile, moved through fallopian tube by cilia and peristalsis

male gametes

• size: 2.5 micrometers (head of sperm)
• number: millions (40 million)
• motility: motile, has tail/flagellum to swim towards egg for fertilisation

pregnancy

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