When is the developing human most susceptible to the occurrence of birth defects from radiation or chemical insults?
A) At the time of birth
B) During the third trimester
C) During the first trimester
D) When it is a zygote
E) During the final stages of organ formation

Question

Quizplus · Accepted Answer

The developing human is most susceptible to the occurrence of birth defects from radiation or chemical insults during the first trimester of pregnancy, which is when major organ systems are forming. The period from week 3-8 is considered the embryonic period, and during this time, the developing embryo is most vulnerable to teratogenic effects. Therefore, exposure to radiation or chemicals during the first trimester can cause serious birth defects or even spontaneous abortion.

When Is the Developing Human Most Susceptible to the Occurrence