Describe the various exposure routes of toxicants in the human body. Discuss the mode of action of toxic substances.

The study of environmental toxicology involves understanding how various toxic substances present in the environment interact with biological systems, particularly the human body. A crucial aspect of this field is understanding the routes through which toxicants enter the body and the mechanisms through which they exert their effects. These toxicants, which may include heavy metals, pesticides, industrial chemicals, air pollutants, and other harmful substances, can cause a wide range of physiological and biochemical disturbances depending on their nature, dose, and duration of exposure.

Exposure Routes of Toxicants in the Human Body

Toxic substances can enter the human body through several primary routes, each influencing the absorption, distribution, and toxicity of the compounds.

1. Inhalation

Inhalation is one of the most common and rapid routes of toxicant entry, especially in occupational and urban environments. Toxic gases, vapors, aerosols, and particulate matter suspended in the air can be inhaled and absorbed through the respiratory tract. The lungs have a large surface area and rich blood supply, which allows for efficient absorption of airborne toxicants into the bloodstream.

Examples include:

• Carbon monoxide, which binds with hemoglobin more efficiently than oxygen, impairing oxygen transport.

• Particulate matter (PM2.5 and PM10), which can penetrate deep into the alveoli and cause inflammation, oxidative stress, and respiratory diseases.

• Volatile organic compounds (VOCs), which _______ _______ ______ __________ ___ ___ __________ ___ _______ ______ ________ ________.
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