Biology › Section Q · Immunity and reproduction › Topic Q.8
Human pregnancy and birth
A human pregnancy turns one implanted blastocyst into a baby of about 3.5 kg, supplied through the placenta and timed by hormones from start to finish. This topic follows that path from implantation to labour and the first feeds. It is for learning biology, not medical advice.
In this topic
- Two clocks for one pregnancy
- Implantation and the hCG signal
- The placenta and umbilical cord
- Worked example: switching between the two clocks
- The first trimester: building the organs
- The second and third trimesters: growth and maturation
- Worked example: hormone levels in early pregnancy
- Labour: positive feedback in action
- Stages of labour, and feeding the newborn
- Preventing and assisting conception
- Common mistakes to avoid
- Key takeaways
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