Multiple Choice
Why are the muscles that move food through your digestive tract called involuntary muscles?
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23. The Digestive System
Introduction to the Digestive System
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What is the primary role of the villi in the digestive system?
A
To transport bile from the liver to the intestine
B
To increase the surface area for nutrient absorption
C
To secrete digestive enzymes
D
To produce hydrochloric acid for digestion
Verified step by step guidance1
Understand the structure of the villi: Villi are small, finger-like projections that line the walls of the small intestine.
Recognize the function of the villi: Their primary role is to increase the surface area of the intestinal lining.
Explain why increased surface area is important: A larger surface area allows for more efficient absorption of nutrients from digested food.
Identify the components of the villi: Villi contain blood vessels and lymphatic vessels, which help transport absorbed nutrients into the bloodstream.
Clarify the misconception: Villi do not transport bile, secrete digestive enzymes, or produce hydrochloric acid. Their main function is nutrient absorption.
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