Question

In the large intestine (colon), what occurs?

1) Significant digestion of proteins
2) Vitamin K synthesis
3) Contribution of brush border enzymes to final stages of digestion
4) Reabsorption of potassium
5) None of these

Answer 1

The large intestine is primarily responsible for the absorption of water, formation of feces, and the synthesis of Vitamin K by intestinal bacteria, rather than significant digestion of proteins or contribution of brush border enzymes.

Step-by-step explanation:

Functions of the Large Intestine

In the large intestine (colon), there is no significant digestion of proteins as most of these processes occur in the earlier sections of the gastrointestinal tract, specifically the stomach and small intestine. Instead, the large intestine is mainly responsible for the reabsorption of water and electrolytes, feces formation, and several other important functions. One of those functions is the synthesis of Vitamin K, which is carried out by the bacteria residing in the colon. Additionally, the large intestine reabsorbs some mineral salts, including potassium, but this is not one of its primary roles as suggested by the options provided. Brush border enzymes are not contributors in this part of the digestion system, as their activity is primarily in the small intestine, not the large intestine.

Therefore, the correct answer to the question about the activity taking place in the large intestine is option 2) Vitamin K synthesis.