The chemical and mechanical digestion of carbohydrates begins in which part of the digestion system?
Stomach
Duodenum
Ascending colon
Mouth
The Correct Answer is D
A. Stomach
Some protein digestion occurs here, but carbohydrate digestion is minimal due to acidic pH inhibiting salivary enzymes.
B. Duodenum
Enzymatic digestion continues here, but it does not begin in the duodenum.
C. Ascending colon
No digestion happens here-only water and electrolyte absorption.
D. Mouth
Salivary amylase begins chemical digestion of carbohydrates, while chewing provides mechanical digestion.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Carrots
Carrots are a root vegetable and belong in the vegetable group.
B. Strawberries
These are fruits, not vegetables.
C. Baked white potato
Although commonly considered a starch, USDA classifies it under vegetables, but non-starchy vegetables like carrots are more emphasized.
D. Greek yogurt
This is a dairy product, not a vegetable.
Correct Answer is B
Explanation
A. Raw carrots and celery
These are vegetables, not grains.
B. Chocolate chip cookies and saltine crackers
These are made from refined white flour, which lacks fiber and some nutrients removed during processing.
C. Popcorn and steel-cut oats
These are whole grains that retain fiber and nutrients.
D. Parmesan cheese and cantaloupe
Cheese is dairy; cantaloupe is fruit—neither are grains.
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