In humans, large intestine is lined with mucus to:
Correct answer: B. Shield the intestinal wall against the altering pH
- A. Increase the surface area for water absorption
- B. Shield the intestinal wall against the altering pH
- C. Assist the movement of undigested food material
- D. Facilitate the membrane proteins in ion transportation
Explanation
In the human digestive system, the large intestine plays a crucial role in absorbing water and electrolytes, forming and expelling feces. It is lined with mucus, which serves several functions, primarily to shield the intestinal walls from the harsh, fluctuating pH levels that can occur during the digestive process. This protective layer helps prevent damage to the cells lining the intestine. While mucus does assist in the movement of waste materials, its key role is in protection. Increasing surface area for absorption and facilitating ion transport are not functions of mucus in the large intestine.
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About Human Digestive System
The human digestive system breaks food into absorbable molecules through mechanical processing, enzyme action and chemical conditions along the alimentary canal. Questions cover the mouth, stomach, small and large intestines, liver, pancreas and associated secretions, including the digestion and absorption of carbohydrates, proteins, lipids, vitamins, minerals and water.
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