Multiple Choice
Which structural modification of the small intestine slows the movement of chyme through the lumen?
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23. The Digestive System
Introduction to the Digestive System
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Why is the colon referred to as the large intestine?
A
Because it is longer than the small intestine.
B
Because it contains more digestive enzymes than the small intestine.
C
Because it has a larger diameter than the small intestine.
D
Because it is the primary site of nutrient absorption.
Verified step by step guidance1
Understand the anatomical structure of the colon and the small intestine. The colon is part of the large intestine, and its primary function is to absorb water and electrolytes, as well as store and eliminate waste.
Compare the physical dimensions of the colon and the small intestine. The colon has a larger diameter, which is why it is referred to as the 'large intestine,' even though the small intestine is longer in length.
Clarify the role of digestive enzymes. The small intestine is the primary site for enzymatic digestion and nutrient absorption, not the colon. The colon primarily deals with water absorption and waste processing.
Eliminate incorrect options based on physiological functions. For example, the colon is not longer than the small intestine, nor does it contain more digestive enzymes. It is also not the primary site of nutrient absorption.
Conclude that the correct answer is based on the anatomical characteristic of the colon having a larger diameter compared to the small intestine, which is why it is referred to as the large intestine.
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