Through which of the following routes can chemicals enter the body?

The correct answer encompasses the various ways that chemicals can enter the body, which is crucial for understanding the potential health risks associated with hazardous materials.

Inhalation allows chemicals to enter the respiratory system, where they can be quickly absorbed into the bloodstream through the lung tissues. Ingestion involves swallowing harmful substances, permitting them to pass through the digestive tract and into the bloodstream. Injection bypasses the body's natural protective barriers, delivering chemicals directly into the tissues or bloodstream. Absorption refers to the uptake of substances through the skin or mucous membranes, which can also lead to systemic exposure.

Recognizing all of these entry routes is essential for implementing appropriate safety measures and protective equipment to minimize exposure to harmful substances in various environments.