Multiple Choice
In humans, most nutrient molecules are absorbed by the __________.
39. Digestive System
Digestion
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Most digestive enzymes function in the __________.
A
large intestine
B
oral cavity
C
stomach
D
liver
E
small intestine
Verified step by step guidance1
Understand the role of digestive enzymes: Digestive enzymes are proteins that help break down food into smaller molecules that can be absorbed by the body.
Identify the main sites of digestion: The primary sites of digestion in the human body are the oral cavity, stomach, and small intestine.
Consider the function of each organ: The oral cavity begins the digestion process with enzymes like amylase. The stomach uses enzymes like pepsin to break down proteins. The small intestine is where most digestion and absorption occur, with enzymes from the pancreas and intestinal lining.
Recognize the role of the small intestine: The small intestine is crucial for digestion as it receives enzymes from the pancreas and bile from the liver, which aid in the breakdown of carbohydrates, proteins, and fats.
Conclude that most digestive enzymes function in the small intestine, where the majority of nutrient absorption takes place.
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