The embryonic period is the most critical period of development because of the formation of internal and external structures. The critical periods of development for the organs are also discussed in the section on specific organ development.
Which is likely to be the most critical stage of fetal development and why quizlet?
Which is the most critical period in fetal development? First trimester During the first trimester, the organs in the fetus are forming. This trimester is considered the most critical time for birth defects. Teratogen Medications that produce fetal malformations or defects in developments are called teratogens.
What stage of pregnancy is the most critical for the development of the fetus in regard to environmental risks?
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.
Which stage of fetal development would be considered a critical period whereby the baby is most vulnerable to teratogens with regard to structural complications?
During organogenesis between days 15 to 60, teratogenic agents are more likely to cause major congenital malformations.