Examine the following cell types and their functions. Which one functions as an exocrine secretor? Cell Type Function Parietal cells Secrete HCl into stomach lumen Alpha cells Secrete glucagon into bloodstream Beta cells Secrete insulin into bloodstream Goblet cells Secrete mucus into respiratory tract
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✓ Correct answer: A. Parietal cellsParietal cells secrete HCl directly into the stomach lumen, which is an exocrine function since it involves secretion into a duct or external surface. Alpha and beta cells secrete hormones directly into the bloodstream, classifying them as endocrine cells. Goblet cells are involved in exocrine secretion, but in this table setting, they were considered incorrect compared to parietal cells' classic known function of HCl secretion in the stomach.
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