What occurs during the third trimester of pregnancy?

What occurs during the third trimester of pregnancy?

• A. Expansion of placenta
• B. Oogenesis
• C. Zygote formation
• D. Rapid development of the fetus, mother's body prepares for labor and delivery

Answer: (D)

In the third trimester, the emphasis is on finishing fetal development and getting ready for birth. The fetus experiences rapid growth and organs reach readiness for life outside the womb—lungs mature with surfactant, body fat increases for insulation and energy, and overall size and weight rise. At the same time, the mother’s body shifts toward labor and delivery: the uterus becomes more responsive to signals that trigger contractions, the cervix begins to soften and dilate, and hormonal changes help initiate the delivery process. This combination—fast fetal development and maternal preparation for labor—best fits what happens in the final trimester. The other events occur earlier in development: placental expansion mainly earlier, oogenesis happens during fetal development, and zygote formation occurs at fertilization.

In the third trimester, the emphasis is on finishing fetal development and getting ready for birth. The fetus experiences rapid growth and organs reach readiness for life outside the womb—lungs mature with surfactant, body fat increases for insulation and energy, and overall size and weight rise. At the same time, the mother’s body shifts toward labor and delivery: the uterus becomes more responsive to signals that trigger contractions, the cervix begins to soften and dilate, and hormonal changes help initiate the delivery process. This combination—fast fetal development and maternal preparation for labor—best fits what happens in the final trimester. The other events occur earlier in development: placental expansion mainly earlier, oogenesis happens during fetal development, and zygote formation occurs at fertilization.