Pregnancy & DevelopmentHESI A2 cheat sheet

Fertilization to birth

8 key facts 4 practice questions Reviewed Oct 2026

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Fertilization

Occurs in the fallopian tube
Zygote → morula → blastocyst → implants in the uterus

Stages

Embryo weeks 1–8 — organs form
Fetus week 9 to birth — growth and maturation
Three trimesters

Placenta

Exchanges gases, nutrients and waste
Produces hCG, estrogen and progesterone

Labor

Driven by oxytocin in a positive feedback loop

Key takeaway

Fertilization to birth

Before you read

Test yourself first: 4 questions

Question 1 of 4

The primary female sex hormone, produced by the ovaries, is:

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