What does it mean to 'ingest' something?

Ingesting something specifically refers to the act of taking in a substance through the mouth and swallowing it, allowing it to enter the digestive system. This process is crucial for providing nutrients and energy to the body through food and beverages. When something is ingested, it undergoes various digestive processes before the body absorbs its nutrients.

The other options describe different methods of introducing substances into the body. Breathing in pertains to inhalation, which is related to the respiratory system, while absorption through the skin involves transdermal methods, and injection refers to delivering substances directly into the body through a syringe or similar device. Each of these processes serves a unique function, distinct from ingestion.