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10 cards from this deck
Hollow ball of cells formed ~4 days after fertilisation
Blastocyst embeds into softened endometrium
Secretes enzymes to break down & soften uterine wall
40 weeks=280 days40 \text{ weeks} = 280 \text{ days}40 weeks=280 days
Embryo: 0-12 weeks; Foetus: 12+ weeks
Protection, temp regulation, movement, hydration
2 arteries (waste out) + 1 vein (nutrients/O2 in)
Attachment, nutrients, gas exchange, waste removal, hormones
No - substances pass by diffusion across barrier
Chorionic villi for placenta & progesterone production
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