Trimester: A division of pregnancy into three equal parts, starting from the first day of the last menstrual period and lasting up to 40 weeks.
Second Trimester: The period from week 14 to week 27 of pregnancy, characterized by significant fetal development such as the formation of external sex organs and lung development.
Third Trimester: The stage from week 28 until birth, involving rapid fetal weight gain, bone hardening, and organ maturation.
Linea nigra: A dark vertical line that appears on the abdomen during pregnancy, indicating pigmentation changes.
Braxton Hicks contractions: Irregular, usually painless contractions of the uterus that occur in the third trimester, often described as false labor.
1. How do the first and second trimesters of pregnancy mainly differ from each other?
2. What is a key physical feature of the fetus around week 14 of development?
3. Who is credited with describing the process where the nuclei of sperm and egg fuse during fertilisation?
Pregnancy stages — division?
First, second, third trimesters.
Second trimester — weeks?
Weeks 14 to 27.
Third trimester — features?
Rapid weight gain, organ maturation.
Fetal development — week 14?
Fetus about 11 inches long.
Fetal development — week 20?
Fetus can hear and swallow.
Fetal development — week 24?
Lungs formed, heartbeat detectable.
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