What does it mean to inject something into someone's body?

Injecting something into someone's body specifically refers to the process of using a needle to introduce a substance directly into the body, often into the bloodstream or a specific tissue. This method is commonly used for administering medications, vaccines, or other therapeutic agents. Using a needle allows for accurate dosing and rapid absorption of the substance into the body’s systems, which can be crucial for treatments that require immediate effects or precise delivery.

The other options describe different methods of administering substances. Administering orally involves swallowing a substance so that it can be digested and absorbed through the gastrointestinal tract. Applying topically means placing a substance on the skin surface, where it may be absorbed, but it does not penetrate the body in the same way an injection does. Inhaling involves breathing in a substance so that it can be absorbed through the lungs. Each of these methods serves different medical purposes, but they do not involve the direct insertion of a substance with a needle, which is what an injection entails.