Which organ is NOT a part of the digestive system?

A. Esophagus

B. Gallbladder

C. Kidneys

D. Mouth

http://www.enchantedlearning.com/subjects/anatomy/digestive/

the correct answer is D

the answer is kidneys.

To determine which organ is not a part of the digestive system, we need to understand what organs make up the digestive system and their functions.

The digestive system is responsible for breaking down food, extracting nutrients, and eliminating waste. It primarily consists of the mouth, esophagus, stomach, small intestine, large intestine, rectum, and anus.

Let's evaluate the options one by one:

A. Esophagus: The esophagus is a muscular tube that carries food from the mouth to the stomach. It is indeed a part of the digestive system.

B. Gallbladder: The gallbladder is an organ that stores bile produced by the liver. It plays a role in digesting fats by releasing bile into the small intestine. So, the gallbladder is a part of the digestive system.

C. Kidneys: The kidneys are not a part of the digestive system. The primary function of the kidneys is to filter waste products from the blood and produce urine. It is a part of the excretory system, not the digestive system.

D. Mouth: The mouth is the starting point of the digestive system. It begins the process of digestion by physically breaking down food and mixing it with saliva.

Therefore, the organ that is not a part of the digestive system is C. Kidneys.