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Question:

Which of the following correctly pairs structure and function?

A stomach / chemical digestion
Explaination

The stomach is responsible for chemical digestion. As food contents enter the stomach, it mixes with digestive enzymes and hydrochloric acid to break down food. The muscular contractions, or segmentation, that the stomach muscles produce helps to move the food around and ensure it thoroughly mixes with the chemicals. While mechanical digestion (i.e. chewing) and chemical breakdown begins in the mouth, nutrient absorption does not occur until the food particles are small enough for absorption and this happens in the small intestine. The duodenum is a segment of the small intestine (where most nutrient absorption takes place). However, reabsorption of water happens in the large intestine, not the small intestine. The colon is a segment of the large intestine which is primarily responsible for reabsorption of water and some electrolytes. The absorption of glucose occurs mainly in the small intestine.