Which human anatomical organ contains the islets of Langerhans and secretes both digestive juices into the duodenum and hormones into the bloodstream?
Answer and explanation
Correct answer: D. pancreas
- Step 1: The pancreas is a dual heterocrine (mixed) gland. Step 2. Its exocrine acinar cells secrete pancreatic juice (amylase, trypsin, lipase) into the duodenum. Step 3. Its endocrine Islets of Langerhans secrete insulin and glucagon directly into blood capillaries. Answer: pancreas. Why not the others: The liver secretes bile (no digestive enzymes); the gallbladder stores bile; the spleen filters blood and stores lymphocytes.
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