Most Teratogens Are Most Harmful to the Developing Fetus During

question 198

Multiple Choice

Most teratogens are most harmful to the developing fetus during the first trimester because

• A) the fetus has not gathered sufficient resources to combat the effects of teratogens.
• B) the placental barrier has not yet fully developed.
• C) the fetal immune system is not yet capable of mounting a response to the teratogenic substance.
• D) the first trimester contains the critical period of development for many major systems and body structures.

---

Definitions:

Differentiation

The process by which cells or tissues undergo a change towards a more specialized form or function, often in context of development.

Adipose Tissue

Connective tissue specializing in fat storage.

Simple Squamous

A single layer of flat cells that contributes to various membranous barriers in the body, such as in the alveoli of lungs or the linings of capillaries.

Stratified Squamous

Refers to a type of epithelial tissue consisting of several layers of flat cells designed to protect underlying tissues in areas subject to abrasion.