Correct Option
The correct option is (c) 2 and 3 only.
Explanation
The pancreas is a unique organ in the human body classified as a heterocrine or composite gland. It possesses both exocrine (enzyme-secreting) and endocrine (hormone-secreting) tissues, allowing it to perform dual functions in digestion and metabolism.
Statement-wise Analysis
- Statement 1 is Incorrect. The pancreas is not exclusively an exocrine gland. It is a mixed gland. The exocrine part secretes alkaline pancreatic juice containing enzymes (like trypsin and lipase) for digestion, while the endocrine part (Islets of Langerhans) secretes hormones directly into the blood.
- Statement 2 is Correct. The endocrine portion of the pancreas contains clusters of cells known as the Islets of Langerhans. Within these islets, Beta cells secrete the hormone insulin, which lowers blood glucose levels, while Alpha cells secrete glucagon.
- Statement 3 is Correct. Anatomically, the pancreas is an elongated organ situated in the abdominal cavity. It is located posterior to the stomach and nestled within the limbs of the 'C'-shaped duodenum, effectively placing it just below and behind the stomach.
Key Takeaway: The pancreas is a mixed (heterocrine) gland located in the loop of the duodenum. It serves a dual role: the exocrine part aids digestion via enzymes, and the endocrine part regulates blood sugar via insulin and glucagon.