Explain the various sources of teratogens and their effects. Describe the process of teratogenesis and the mechanism of action.

Teratogens are substances that cause developmental malformations or congenital abnormalities in an embryo or fetus. The effects of teratogens can range from subtle defects to severe malformations, depending on the timing, dose, and nature of the exposure. Understanding the sources of teratogens and the process of teratogenesis is crucial for preventing birth defects and promoting healthier pregnancies. Environmental toxicology plays a significant role in studying how these harmful agents affect human development.

### Sources of Teratogens

Teratogens can originate from a variety of sources, including physical, chemical, biological, and environmental agents. These sources can be categorized into the following major groups:

1. Chemical Teratogens
   - Pharmaceuticals and Medications: Certain prescription drugs, over-the-counter medications, and illicit substances can be teratogenic. For example, thalidomide, an anti-nausea drug used in the 1950s and 1960s, is infamous for causing limb deformities in babies when taken by pregnant women. Other drugs like anticonvulsants (e.g., valproate, phenytoin) and certain acne treatments containing isotretinoin have been linked to neural tube defects, craniofacial abnormalities, and heart malformations.
   - Alcohol: Maternal alcohol consumption is one of the most common causes of fetal alcohol spectrum disorders (FASDs). Alcohol can cross the placenta and _________ _______ ______ ________ __________ _____ ________ ___ ____.
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