**Core Concept**
Centroacinar cells are a type of epithelial cell found at the junction of the pancreatic acinus and the ductal system. They play a crucial role in the secretion of digestive enzymes from the pancreas into the pancreatic duct. The correct function of centroacinar cells is essential for maintaining the digestive process.

**Why the Correct Answer is Right**
Centroacinar cells secrete digestive enzymes, specifically **amylase**, which breaks down carbohydrates into simple sugars. This process is essential for the digestion of starches and other complex carbohydrates in the small intestine. The secretion of amylase by centroacinar cells is mediated by the **hormone cholecystokinin (CCK)**, which stimulates the pancreas to release digestive enzymes in response to food intake. The enzymes secreted by centroacinar cells are then transported through the pancreatic duct to the small intestine, where they facilitate the breakdown of nutrients.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because centroacinar cells do not primarily secrete **bicarbonate ions**. While bicarbonate ions are indeed secreted by the pancreas, they are primarily produced by the ductal cells, not centroacinar cells.
* **Option B:** This option is incorrect because centroacinar cells do not primarily secrete **proteases**. While proteases are essential digestive enzymes, they are primarily secreted by the acinar cells, not centroacinar cells.
* **Option D:** This option is incorrect because centroacinar cells do not primarily secrete **lipase**. While lipase is an essential digestive enzyme, it is primarily secreted by the acinar cells, not centroacinar cells.

**Clinical Pearl / High-Yield Fact**
Centroacinar cells are an essential part of the pancreatic exocrine system, and their dysfunction can lead to pancreatic insufficiency and malabsorption of nutrients. In patients with chronic pancreatitis, the damage to centroacinar cells can lead to a decrease in digestive enzyme secretion, resulting in malabsorption and weight loss.

**Correct Answer:** C.