During which trimester is the fetus at greatest risk?

What trimester is most critical?

The first trimester is the most crucial to your baby’s development. During this period, your baby’s body structure and organ systems develop.

In which trimester is the embryo most vulnerable quizlet?

Most critical trimester (b/c embryo’s most vulnerable) 1st month: (end of) primitive heart & digestive system develop, basic initiation of a brain and nervous system apparent, small buds that will eventually be arms/feet are appearing. Development will start with brain and continues to go down.

What happens to the fetus in the second trimester?

The baby’s organs become fully developed during the second trimester. The baby can also start to hear and swallow. Small hairs become noticeable. Later on in the second trimester, the baby will begin to move around.

Which period of prenatal development is the most critical?

The embryonic period is the most critical period of development because of the formation of internal and external structures.

Which trimester is the most difficult?

The first trimester of pregnancy can often be the hardest. Pregnancy hormones, extreme fatigue, nausea and vomiting, tender breasts, and perpetually needing to wee make life growing a human no easy feat.

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What is the most delicate trimester?

The first trimester (weeks 1-12) is the most fragile period, during which all major organs and systems in your baby’s body are formed. Most birth defects and miscarriages occur during the first trimester.

In which trimester is the embryo most vulnerable?

The fetus is most vulnerable during the first 12 weeks. During this period of time, all of the major organs and body systems are forming and can be damaged if the fetus is exposed to drugs, infectious agents, radiation, certain medications, tobacco and toxic substances.

In which trimester of pregnancy is the fetus the most vulnerable to teratogens?

The embryonic period, during which organogenesis takes place, occurs between implantation at around 14 days to around 60 days postconception. This is usually the most sensitive period to teratogenesis when exposure to a teratogenic agent has the greatest likelihood of producing a malformation.

Why is the embryonic stage particularly vulnerable to teratogens?

The embryo is most susceptible to teratogenic agents during periods of rapid differentiation. The stage of development of the embryo determines suscep- tibility to teratogens. The most critical period in the development of an embryo or in the growth of a particular organ is during the time of most rapid cell division.

What key changes occur to the fetus during the second and third trimesters?

In the first trimester, your baby will grow from a fertilized egg into a moving fetus with eyes, ears, and working organs. In the second trimester, your baby’s features develop and you may be able to feel your baby move. In the third trimester, your baby will grow rapidly to get ready for birth.

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