Fertilisation and the Stages of Prenatal Development (VCE SSCE Health and Human Development): Flashcards

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