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

Teratogens are agents that cause abnormalities or malformations in a developing embryo or fetus. These harmful substances can interfere with normal growth and development during pregnancy, leading to congenital defects or even fetal death. Environmental toxicology studies the impact of such agents on living organisms and their ecosystems, focusing on how these toxic substances can affect reproduction and development. The sources of teratogens, their effects, the process of teratogenesis, and mechanisms of action are important topics in understanding how environmental factors influence prenatal health.

Sources of Teratogens

Teratogens originate from various environmental, chemical, biological, and physical sources. These can be broadly categorized as follows:

1. Chemical Teratogens: Many chemicals found in the environment, workplace, or household can act as teratogens. These include industrial pollutants, heavy metals like lead and mercury, pesticides, solvents, and certain pharmaceutical drugs. For example, thalidomide, a drug used in the 1950s and 1960s for morning sickness, caused severe limb deformities in babies. Similarly, alcohol is a well-known teratogen causing fetal alcohol syndrome. Other drugs such as isotretinoin (used for acne treatment), anticonvulsants, and chemotherapy agents have teratogenic potential.

2. Biological Teratogens: Certain infections or microorganisms can cross the placental barrier and cause developmental damage. _______ ______ _________ _______ _________ _________ _______ ________ ____.
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