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The embryonic period are the first eight weeks of development of the child, beginning with fertilization. During this period, the embryo undergoes an amazing transformation from a single cell to a recognizably human embryo. In the mid-twentieth century, George Streeter devised a commonly used embryo classification system by dividing the embryonic period into 23 stages. The embryonic period is followed by the fetal period, which encompasses the remainder of theprenatal development.

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Which has the longest sensitive period to teratogens during pregnancy?

The longest sensitive period to teratogens during pregnancy typically occurs during the embryonic stage, particularly from weeks 3 to 8 post-conception. During this time, the foundational structures and organs of the fetus are developing, making it highly vulnerable to harmful substances. Exposure to teratogens during this critical period can lead to significant congenital anomalies and developmental issues. Although the risk persists throughout pregnancy, the embryonic stage is particularly crucial.


How is a period during pregnancy different?

During pregnancy, the period stops.


During which prenatal period are the placenta and umbilical chord formed?

embryonic period


During the embryonic period, what developmental processes occur in the embryo?

During the embryonic period, the embryo undergoes processes such as cell division, differentiation, and the formation of basic body structures and organs.


Is embryonic stage and the first trimester the same?

The embryonic stage is a part of the first trimester. The first trimester is the first three months of pregnancy and the embryonic period ends around week 8 and it then becomes a fetus.


Could you have your period during pregnancy?

No.


What is that embryonic period blood?

Embryonic blood is blood when ur at ur period I think


What mammal is pregnant for 21 days?

Rabbit is a mammal which is pregnant for 21 days . Pregnancy is called gestation period in which embryonic development is completed .


If you get your period during pregnancy will your pregnancy test results come out negative?

No


Can you have a period first month of pregnancy?

No, you cannot have a period the first month of pregnancy or at any other time during pregnancy. Menstruation occurs if the egg has not been fertilised, and you cannot menstruate during pregnancy.


Is a period during pregnancy and pregnancy symptoms hereditary?

A period during pregnancy is not hereditary however it is never a normal period. It's simply a light period or vaginal bleeding. Pregnancy symptoms are not hereditary. Every woman will experience different pregnancy symptoms and the same woman may have different symptoms in different pregnancies. There are things that go on during pregnancy which can be symptomatic and hereditary, but these are separate from the symptoms which indicate pregnancy.


I had period and seven days after your Dr say Im pregnancy?

Its possible to have bleeding during pregnancy that You mistake for your period