The embryonic stage, which lasts from fertilization until around 8 weeks, is the most rapid period of prenatal development in humans. This is when the major organs and systems of the body begin to form.
The first period of prenatal development is the germinal stage, which lasts for the first two weeks after conception. During this stage, the fertilized egg, or zygote, undergoes rapid cell division and eventually forms a blastocyst. The blastocyst implants itself into the uterine wall, marking the end of the germinal stage.
Prenatal development occurs in three main stages: the germinal stage (first two weeks after conception), the embryonic stage (weeks 3-8), and the fetal stage (weeks 9-birth). During these stages, the fertilized egg undergoes cell division, differentiation, and organ formation, leading to the development of a fetus.
Breathing movements begin during the fetal stage of prenatal development, which starts around the 9th week after conception and lasts until birth. It is during this stage that the muscles responsible for breathing, such as the diaphragm, start to develop and the fetus practices breathing movements by inhaling and exhaling amniotic fluid.
The most vulnerable stage in prenatal development is during the first trimester, particularly between weeks 3 to 8. This is when the major organs and systems are forming and are most susceptible to teratogens, which are substances that can cause birth defects. It is important for pregnant women to take extra precautions during this critical period.
An organism at an early stage of its development is referred to as an embryo. During this stage, the organism undergoes rapid cell division and differentiation to form various tissue layers and organs. The embryo is crucial for the development of the organism into its final form.
First Stage: The first two weeks after conception are known as the Germinal stage. Second Stage: The next six weeks of development are known as the Embryonic stage. Third Stage: The remainder of prenatal development is known as the Fetal stage.
The first period of prenatal development is the germinal stage, which lasts for the first two weeks after conception. During this stage, the fertilized egg, or zygote, undergoes rapid cell division and eventually forms a blastocyst. The blastocyst implants itself into the uterine wall, marking the end of the germinal stage.
embryonic
Prenatal, infancy, childhood, adolescence and adulthood.
embryonic
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Prenatal development occurs in three main stages: the germinal stage (first two weeks after conception), the embryonic stage (weeks 3-8), and the fetal stage (weeks 9-birth). During these stages, the fertilized egg undergoes cell division, differentiation, and organ formation, leading to the development of a fetus.
Breathing movements begin during the fetal stage of prenatal development, which starts around the 9th week after conception and lasts until birth. It is during this stage that the muscles responsible for breathing, such as the diaphragm, start to develop and the fetus practices breathing movements by inhaling and exhaling amniotic fluid.
The first stage is conception, in which is the making and having of the female or male child.
The most vulnerable stage in prenatal development is during the first trimester, particularly between weeks 3 to 8. This is when the major organs and systems are forming and are most susceptible to teratogens, which are substances that can cause birth defects. It is important for pregnant women to take extra precautions during this critical period.
Embryo
An organism at an early stage of its development is referred to as an embryo. During this stage, the organism undergoes rapid cell division and differentiation to form various tissue layers and organs. The embryo is crucial for the development of the organism into its final form.