Examlex
A primary source of acid from internal respiration is CO2.
Embryonic Stage
A phase of prenatal development that occurs from the second to the eighth week after fertilization, during which major body structures and organs begin to form.
Uterine Wall
The muscular and membranous layer surrounding the uterus, which thickens during the menstrual cycle and pregnancy to support fetal development.
Germinal Stage
The first phase of prenatal development, encompassing the first two weeks after conception, during which the zygote begins to divide and grow.
Prenatal Development
The progression of maturation and evolution inside the uterus from the moment of conception until delivery.
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