Implantation of the Blastocyst and Gestation (Grade 12 NSC Matric Life Sciences): Flashcards

Hollow ball of cells formed ~4 days after fertilisation

Blastocyst embeds into softened endometrium

Secretes enzymes to break down & soften uterine wall

$40 \text{ weeks} = 280 \text{ days}$

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