Which of the following is NOT a route of entry for toxic substances?

The concept of routes of entry for toxic substances refers to the ways in which hazardous materials can enter the body. Inhalation, ingestion, and absorption are all recognized routes through which toxic substances can impact a person's health.

Inhalation occurs when harmful substances are breathed in through the air, where they can then affect the respiratory system and enter the bloodstream. Ingestion involves the swallowing of contaminated substances, which can occur through eating or drinking, allowing toxins to enter the digestive system. Absorption occurs when toxic substances come into contact with the skin, enabling them to be absorbed and enter the bloodstream directly.

In contrast, inspiration is not a scientifically recognized term for a route of entry in this context. It is often mistakenly used interchangeably with inhalation, but the correct terminology for the process of taking air into the lungs is "inhalation." Therefore, while the first three choices accurately describe established routes through which toxins can enter the body, inspiration does not correctly classify as a route of entry for toxic substances.