Which of the following statements regarding glucagon is false?

Options

A. It is secreted by `alpha-` cells of langerhans.
B. It acts antagonistically t insulin.
C. It decrease blod sugar level.
D. The gland responsible for its secretion is a heterocrine gland.

Explanation

To determine which statement regarding glucagon is false, let's analyze each option step by step:

1. **Statement 1: Glucagon is secreted by alpha cells of Langerhans.**
- **Analysis:** Glucagon is indeed secreted by the alpha cells located in the islets of Langerhans in the pancreas. This statement is true.

2. **Statement 2: Glucagon acts antagonistically to insulin.**
- **Analysis:** Glucagon and insulin have opposing effects on blood glucose levels. While insulin lowers blood glucose by promoting the conversion of glucose to glycogen, glucagon raises blood glucose by promoting the conversion of glycogen back to glucose. This statement is also true.

3. **Statement 3: Glucagon decreases blood glucose levels.**
- **Analysis:** This statement is false. Glucagon actually increases blood glucose levels by stimulating glycogenolysis (the breakdown of glycogen to glucose) in the liver. Therefore, this statement is incorrect.

4. **Statement 4: The gland responsible for the secretion of glucagon is a heterocrine gland.**
- **Analysis:** The pancreas is indeed a heterocrine gland, as it has both endocrine functions (secreting hormones like insulin and glucagon) and exocrine functions (producing digestive enzymes). This statement is true.

**Conclusion:** The false statement regarding glucagon is **Statement 3: It decreases blood glucose levels.**