Structure of Foetus

Exchange of substances between maternal and foetal blood

O2 and waste products (urea, CO2) cross placenta by diffusion

Glucose enters foetal blood by facilitated diffusion

Amino acids enter foetal blood by active transport

- Placenta contains many mitochondria

Maternal antibodies are taken into villi by pinocytosis

- Infant has immunity to same diseases as its mother after birth

Secretes hCG (oestrogen, progesterone), maintains pregnancy

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