ABDOMINAL
GASTROINTESTINAL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They act on the surfaces of food particles
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They act on the surfaces of the stomach walls.
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They act on the gastric juice
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None of the above
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Detailed explanation-1: -Chewing breaks the small into the big. The mechanical digestion of food in the mouth involves the transformation into smaller fragments of bite-sized bits of food. This has the effect of growing the food particles’ surface area and enabling saliva to be thoroughly mixed with them.
Detailed explanation-2: -Digestive enzymes play a key role in breaking down the food you eat. These proteins speed up chemical reactions that turn nutrients into substances that your digestive tract can absorb. Your saliva has digestive enzymes in it. Some of your organs, including your pancreas, gallbladder, and liver, also release them.
Detailed explanation-3: -Mechanical digestion in the oral cavity consists of grinding of food into smaller pieces by the teeth, a process called mastication. Chemical digestion in the mouth is minor but consists of salivary amylase (ptyalin, or alpha-amylase) and lingual lipase, both contained in the saliva.