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10 cards from this deck
When sperm penetrates ovum, creating a zygote
46: 23 from sperm, 23 from ovum
Germinal (0-2wks), Embryonic (3-8wks), Foetal (9-38wks)
0-2 weeks, ends with implantation
3-8 weeks, most critical period
Cells taking on specialised roles
Substances/factors causing developmental defects
9-38 weeks, final prenatal stage
Week 14 of pregnancy
Prevents lung air sacs from collapsing during breathing
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