ANATOMY

Detailed explanation-1: -the accessory organ of digestive system include teeth, tongue gallbladder, liver etc. the question is which is NOT an accessory organ, and the answer is teeth.

Detailed explanation-2: -The gastrointestinal tract consists of the oral cavity, pharynx, esophagus, stomach, small intestine, and large intestine. The accessory organs are the teeth, tongue, and glandular organs such as salivary glands, liver, gallbladder, and pancreas.

Detailed explanation-3: -The salivary glands, liver and gall bladder, and the pancreas aid the processes of ingestion, digestion, and absorption. These accessory organs of digestion play key roles in the digestive process.

Detailed explanation-4: -Answer and Explanation: The correct answer is A. Mouth. Mouth is not considered an accessory digestive structure.

Detailed explanation-5: -So the organ that does not produce any digestive enzymes is the liver.