Which organ is part of the digestive system?

• A. Esophagus
• B. Lungs
• C. Kidneys
• D. Brain

Answer: (A)

The organ being tested is part of the digestive system that moves food from the mouth toward the stomach. The esophagus is a muscular tube that carries swallowed food down through rhythmic contractions called peristalsis, beginning the process of digestion after chewing and swallowing. It’s a direct component of the digestive tract.

Lungs handle breathing and gas exchange, not digestion. Kidneys filter waste from the blood and form urine, part of the urinary system. The brain, while it helps regulate digestive processes via nerves, is part of the nervous system and not a digestive organ itself.