______________ is the most susceptible to teratogens.

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BlackTom AI · Accepted Answer

The question asks which period is most susceptible to teratogens. 
Option 1: 'Fourth trimester' — This is after birth, when teratogens cannot affect a developing fetus in utero. Therefore this choice is incorrect for fetal teratogenic susceptibility.
Option 2: 'First trimester' — The first trimester encompasses major organ formation (organogenesis). Teratogens during this window have the highest probability of causing structural malformations and critical defects, making this the correct conceptually supported choice.
Option 3: 'Second trimester' — While teratogens can still affect fetal development, most major structural abnormalities have already occurred during organogenesis in the first trimester, so the sensitivity is lower than in the first trimester.
Option 4: 'Third trimester' — Although growth and maturation continue and there can be effects (e.g., functional or growth issues), the peak vulnerability to teratogens is earlier, in the first trimester, making this less susceptible in comparison.
In sum, the rationale hinges on the concept of organogenesis driving peak teratogenic risk in early pregnancy, which is why the first trimester is identified as the most susceptible period.

BIO 132-Introduction to Nutrition-931 Exam 4

______________ is the most susceptible to teratogens.

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