The embryonic period is the most sensitive time for teratogen exposure.

Question

BlackTom AI · Accepted Answer

When evaluating the statement about teratogen exposure, it's essential to map the timing of development to vulnerability.
Option 1: 'True.' The embryonic period, roughly from week 3 to week 8 of gestation, is the phase of organogenesis. During this window, the developing organs are forming, so teratogens can cause major structural anomalies. This makes the period particularly sensitive to harmful exposures compared with other times in pregnancy.
Option 2: 'False.' This would be incorrect because it contradicts the well-established pattern of teratogenic risk. While other periods (like the early pre-embryonic stage and the fetal period) have their own susceptibilities—such as the 'all-or-none' response in the very early weeks and functional/growth effects later—the embryonic period is classically recognized as the peak time for major congenital malformations due to teratogens, not a time of relatively low risk.
Additional nuance: exposures outside the embryonic period can still be harmful (e.g., leading to growth restriction, neurodevelopmental issues, or functional deficits), but the question specifically asks about the highest sensitivity for structural malformations, which is most prominent during organogenesis in the embryonic period.

Dashboard Quiz 1

The embryonic period is the most sensitive time for teratogen exposure.

查看解析

登录即可查看完整答案

类似问题

True or false? If a teratogen is introduced after a particular organ has formed, it may not have much of an effect on the structure of that particular organ.

Children whose mothers drank alcohol during pregnancy often have a specific set of facial features, may have heart defects, and brain damage. Children whose mothers took thalidomide for morning sickness may have malformed limbs. These examples illustrate

Which of the following options is an accurate description of the effects of teratogens?

What is a teratogen?

______________ is the most susceptible to teratogens.

Teratogens ____.

What is the term for anything that damages or interferes with the development of an embryo of fetus?

27. Birth defects may be caused by a variety of environmental agents, called _________________, which include some bacteria and viruses, various drugs and chemicals, and radiation.

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单