Gestation

Gestation is the period of time during which an embryo or fetus develops inside the uterus of a female, from fertilization to birth. In humans, this process takes approximately nine months, but the gestation period can vary among different species.

Overview

Gestation in humans begins at the moment of fertilization, when a sperm cell penetrates an egg cell, forming a fertilized egg, or zygote. The zygote then travels down the fallopian tube and implants itself into the wall of the uterus, where it begins to grow and develop into an embryo.

During the first eight weeks of gestation, the developing organism is referred to as an embryo. After this point, it is referred to as a fetus until the time of birth. Throughout gestation, the fetus grows and develops, preparing for life outside the uterus.

Stages of Gestation

Gestation is typically divided into three stages, or trimesters:

• First Trimester: This stage lasts from fertilization to the end of week 12. During this time, the embryo develops its most critical structures, including the brain, heart, and lungs.

• Second Trimester: This stage lasts from week 13 to the end of week 26. During this time, the fetus continues to grow and develop, and its features become more defined.

• Third Trimester: This stage lasts from week 27 until birth. During this time, the fetus continues to grow and mature, and the mother's body prepares for labor and delivery.

Factors Affecting Gestation

Several factors can affect the length and health of gestation, including the mother's health, age, and lifestyle, as well as any genetic or environmental factors that may impact fetal development.

See Also

• Pregnancy
• Embryo
• Fetus
• Trimester
• Labor
• Delivery

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