What are the four main ways that drugs can enter the body?

The correct answer encompasses the four primary routes through which drugs can be introduced into the body: inhalation, injection, oral (ingestion), and absorption.

Inhalation allows substances to enter directly into the lungs, where they can quickly enter the bloodstream due to the rich network of blood vessels in that area. Injection refers to substances being delivered directly into the bloodstream or tissues, providing rapid effects. Oral administration involves swallowing, where drugs are absorbed through the digestive system, affecting the body once they pass through the liver and into the bloodstream. Absorption typically refers to drugs that are applied to the skin or mucous membranes and taken into the bloodstream or local tissue, such as patches or gels.

Other options, while they mention relevant methods, do not cover the main systematic approaches as comprehensively as the correct answer. For instance, mentioning "drinking" is similar to oral administration but does not specify the broader category of ingestion or the process involved. Additionally, referencing "through skin" is quite generic compared to the defined method of absorption. Snorting, while a valid route, is more specialized and does not align with the standard terminology typically used to cover the four main entry points into the body. Thus, the chosen answer accurately reflects the principal