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Question

All of the following is true about the digestive system, except

A
Digestive enzymes from the pancreas are released via a duct into the duodenum.
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B
Peristalsis is a wave of smooth-muscle contraction that proceeds along the digestive tract.
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C
In the small intestine, villi absorb nutrients into both the lymphatic and circulatory systems.
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D
The low pH of the stomach is essential in order for carbohydrate digestive enzymes to function.
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E
The release of bile from the gallbladder is triggered by the hormone cholecystokinin.
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Solution

The correct option is D The low pH of the stomach is essential in order for carbohydrate digestive enzymes to function.
The saliva contains an enzyme called salivary amylase which initiates breaking down of starch into maltose. The complete digestion of carbohydrate occurs in small intestine by pancreatic amylase. The activity of both of these enzymes is affected by pH. Salivary amylase requires pH of 6.5 to 7 to function while the enzymes in small intestines require pH around 7.5 for functioning well.
So, option D is the correct answer.

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