Inhalation is defined as

Inhalation is defined as

• A. The act of injecting a substance into tissue.
• B. The act of breathing in a substance.
• C. The act of swallowing a substance.
• D. The act of absorbing through skin.

Answer: (B)

Inhalation means taking a substance into the body by breathing it into the lungs. This route involves the respiratory system and differs from other exposure routes like ingestion (swallowing), dermal absorption (through the skin), or injection (into tissue or bloodstream). So the act of breathing in a substance is the essence of inhalation, which is why this option is the best fit.

Inhalation means taking a substance into the body by breathing it into the lungs. This route involves the respiratory system and differs from other exposure routes like ingestion (swallowing), dermal absorption (through the skin), or injection (into tissue or bloodstream). So the act of breathing in a substance is the essence of inhalation, which is why this option is the best fit.