What are the four routes of entry a product can have to enter the human body?

The four routes of entry for a product to enter the human body are inhalation, ingestion, injection, and absorption.

Inhalation refers to breathing in substances that can enter the body through the respiratory system. Common examples include airborne pollutants or vapors.

Ingestion involves consuming substances orally, allowing them to enter the digestive system, which can include food, liquids, or toxic chemicals.

Injection is the direct introduction of a substance into the bloodstream or body tissues, typically accomplished with a syringe or needle, which bypasses other entry ways entirely.

Absorption occurs when substances penetrate the body through the skin or mucous membranes, illustrating how toxins can enter through contact with contaminated surfaces.

These entry routes are critical for understanding how chemicals or hazardous materials can affect health, especially in the context of law enforcement and public safety, as officers may encounter various substances in the field. The other options do not accurately reflect recognized routes of entry for substances into the human body.