**Explanation:**
The correct answer is option C) अग्न्याशय (Pancreas).
The pancreas is a glandular organ located in the abdominal cavity. It plays an essential role in the endocrine system by producing and releasing hormones into the bloodstream. One of the important hormones produced by the pancreas is insulin, which helps regulate blood sugar levels.
Here is a detailed explanation of the role of the pancreas in hormone secretion:
1. **Endocrine Function of the Pancreas:**
The pancreas contains clusters of cells called islets of Langerhans, which are responsible for the production and release of hormones. These islets consist of different types of cells, including alpha cells, beta cells, delta cells, and PP cells.
2. **Insulin and Glucagon:**
The beta cells in the islets of Langerhans produce and release insulin, a hormone that helps regulate blood sugar (glucose) levels. Insulin allows cells in the body to take up glucose from the bloodstream and use it for energy or store it for future use. It also promotes the storage of excess glucose as glycogen in the liver.
On the other hand, the alpha cells in the islets of Langerhans produce and release glucagon, another important hormone. Glucagon acts opposite to insulin and increases blood sugar levels by stimulating the breakdown of glycogen in the liver, releasing glucose into the bloodstream.
3. **Other Pancreatic Hormones:**
Apart from insulin and glucagon, the pancreas also produces and releases other hormones such as somatostatin and pancreatic polypeptide.
- **Somatostatin**, produced by delta cells, inhibits the release of insulin and glucagon, thereby helping to regulate their levels.
- **Pancreatic polypeptide**, produced by PP cells, regulates the secretion of digestive enzymes in the pancreas.
Overall, the pancreas plays a crucial role in maintaining proper blood sugar levels and regulating various metabolic processes in the body through the secretion of hormones. The hormones produced by the pancreas, particularly insulin and glucagon, are essential for maintaining glucose homeostasis and preventing conditions like diabetes.