How can lead particles enter the human body?

Lead particles can enter the human body through multiple pathways, which makes the third option the most accurate. Inhalation occurs when lead dust or fumes are breathed in, particularly in environments where lead is present, such as during certain types of construction or renovation work. Ingestion is another common route, which can happen when lead particles settle on food, hands, or surfaces and are subsequently consumed or when children ingest lead dust after putting contaminated objects in their mouths. Furthermore, dermal absorption can also occur, although it is less significant than the other two routes, when lead dust comes into contact with the skin. Each pathway emphasizes the multifaceted ways in which lead exposure can happen, making it crucial to consider all three routes for assessing potential risks and implementing safety measures.