Which of the following is the primary physiological function of the large intestine?

• A. Absorption of water and electrolytes
• B. Secretion of digestive enzymes
• C. Digestion of proteins
• D. Production of bile

Answer: (A)

Verified step by step guidance

1. Understand the role of the large intestine in the digestive system. The large intestine is primarily involved in the final stages of digestion and absorption, focusing on water and electrolyte balance.
2. Recall that the large intestine does not secrete digestive enzymes. Digestive enzymes are primarily secreted by the stomach, pancreas, and small intestine to break down food molecules.
3. Recognize that protein digestion occurs earlier in the digestive process, primarily in the stomach and small intestine, where enzymes like pepsin and trypsin are active.
4. Understand that bile production is a function of the liver, not the large intestine. Bile aids in the digestion and absorption of fats and is stored in the gallbladder.
5. Conclude that the primary physiological function of the large intestine is the absorption of water and electrolytes, which helps maintain fluid balance and form solid feces.