Multiple Choice
Which structure regulates the exit of partially digested food from the stomach into the small intestine?
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23. The Digestive System
Introduction to the Digestive System
Multiple Choice
Which of the following is NOT a primary function of the digestive system?
A
Mechanical and chemical breakdown of food into smaller molecules
B
Elimination of indigestible material and waste as feces
C
Absorption of nutrients, water, and electrolytes into the body
D
Production of red blood cells in the bone marrow
Verified step by step guidance1
Step 1: Understand the primary functions of the digestive system. The digestive system is mainly responsible for breaking down food, absorbing nutrients, and eliminating waste.
Step 2: Identify the functions listed in the problem: mechanical and chemical breakdown of food, elimination of waste as feces, absorption of nutrients, water, and electrolytes, and production of red blood cells in the bone marrow.
Step 3: Recognize that mechanical and chemical breakdown of food involves processes like chewing and enzymatic digestion, which are core digestive functions.
Step 4: Note that absorption of nutrients, water, and electrolytes into the body occurs primarily in the small intestine, another key digestive role.
Step 5: Understand that production of red blood cells in the bone marrow is a function of the skeletal and hematopoietic systems, not the digestive system, making it the correct answer as the function NOT related to digestion.
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