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Pregnancy begins with conception or fertilization with the fusion of an egg and sperm within a woman’s body and continues until childbirth, typically thirty-eight weeks later. This gestational time is divided into three approximately equal periods called trimesters, each associated with specific physical and biochemical hallmarks.
Salem Press Encyclopedia of Science, 2023. 3p.
Pregnancy is the development of an embryo or fetus within the uterus, which begins with conception. There are numerous Research Starter articles related to this topic. The list below includes the most relevant Research Starter items.
Pregnancy is a time of dramatic transitions. Body systems that once sustained a single human now support two. Organs, blood vessels, body chemistry, and even the solid supporting structures of a woman’s body all go through changes; in the meantime, the fetus’s body grows from a single diploid cell called a zygote to a full-sized baby.
Salem Press Encyclopedia of Health, 2022. 3p.
