Gestation

Definition

Gestation is the period of development from fertilization to birth in mammals. It involves the growth and maturation of the embryo and fetus inside the mother's uterus.

5 Must Know Facts For Your Next Test

1. Human gestation typically lasts about 40 weeks, divided into three trimesters.
2. During gestation, the placenta facilitates nutrient and gas exchange between mother and fetus.
3. The first trimester is critical for organ development and differentiation.
4. Fetal movements are usually felt by the mother around the 18th to 20th week of gestation.
5. Hormonal changes during gestation prepare the mother's body for childbirth and lactation.

Review Questions

• What is the average duration of human gestation?
• How does the placenta function during gestation?
• In which trimester does organ development primarily occur?

Related terms

Placenta: An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the growing baby.

Trimester: One of three roughly equal periods into which a pregnancy is divided, each lasting approximately three months.

Embryo:

The early stage of development in humans from fertilization until about eight weeks.