Gestation

Definition

Gestation is the period of development during which an embryo or fetus grows inside the mother's uterus until birth. In humans, this period typically lasts about 40 weeks from the last menstrual period.

5 Must Know Facts For Your Next Test

1. The human gestation period is divided into three trimesters, each with distinct developmental milestones.
2. Placental exchange occurs during gestation, providing oxygen and nutrients to the developing fetus.
3. Critical organ systems such as the heart and nervous system begin to form in the first trimester.
4. Fetal movement can usually be felt by the mother around the middle of the second trimester.
5. Premature birth is defined as delivery before 37 weeks of gestation and can result in complications for the newborn.

Review Questions

• What are the three major stages of human gestation called?
• At what week range does human gestation typically conclude?
• Why is premature birth a concern in terms of fetal development?

Related terms

Embryo:

An early stage of development that lasts from fertilization until about eight weeks in humans.

Fetus: The developmental stage following an embryo, lasting from nine weeks after fertilization until birth.

Placenta:

An organ that forms during pregnancy to provide nutrients and oxygen to the growing fetus while removing waste products.