Question

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

Name: Problem 10, Chapter 44: Life: The Science of Biology
Uploaded: 2021-04-20T21:06:37-08:00
Duration: 1 min 42 s
Channel: Katie Haasch
Description: 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

   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

Life: The Science of Biology

David E. Sadava,… 9th Edition

Chapter 44, Problem 10

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Solved by Expert Katie Haasch

04/20/2021

Step 1

The first trimester is when implantation, gastrulation, and cell differentiation occur. This is also when the placenta and organs begin to form. The second trimester is characterized by rapid growth and the first fetal movements. The third trimester is also a time Show more…

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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

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Key Concepts

Critical Period of Development

This refers to the specific time during prenatal development when rapidly forming tissues and organs are most sensitive to external insults. Disruptions during this period can lead to irreversible defects.

Teratogens

Teratogens are agents such as chemicals, radiation, or infections that can cause developmental abnormalities or birth defects when exposure occurs during pregnancy.

Organogenesis

Organogenesis is the process in which organs are formed, largely occurring during the first trimester. Because this is when the basic body plan and essential structures are established, this phase is particularly vulnerable to teratogenic exposures.

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