Multiple Choice
Which accessory organ of the digestive system does not produce any enzymes or digestive secretions?
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23. The Digestive System
Introduction to the Digestive System
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Which of the following is a feature of the digestive tube in most animal phyla?
A
A complete digestive tract with a separate mouth and anus
B
Digestion occurring entirely outside the body
C
A single opening serving as both mouth and anus
D
Absence of specialized regions for digestion
Verified step by step guidance1
Understand the structure of a complete digestive tract: It typically consists of a continuous tube with two separate openings, a mouth for intake and an anus for waste elimination.
Recognize that a complete digestive tract allows for a more efficient digestion process, as food moves in one direction and can be processed in specialized regions.
Consider the alternative options: Digestion occurring entirely outside the body is not typical for most animal phyla, as internal digestion allows for better nutrient absorption.
Evaluate the option of a single opening serving as both mouth and anus: This is characteristic of a gastrovascular cavity, found in simpler organisms like cnidarians, not most animal phyla.
Identify the absence of specialized regions for digestion: This is less efficient and not a feature of a complete digestive tract, which typically has specialized regions for different digestive processes.
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