Which one of the following pairs is incorrectly matched ?

Options

A. Insulin - Diabetes mellitus (disease)
B. Glucagon - Beta cells (source)
C. Somatostatin - Delta cells (source)
D. Corpus luteum - Relaxin (secretion)

Answer

To determine which pair is incorrectly matched, we will analyze each pair provided in the question step by step.

### Step 1: Analyze the first pair - Insulin and Diabetes Mellitus
- **Explanation**: Insulin is a hormone that regulates blood sugar levels. Diabetes mellitus is a condition characterized by high blood sugar levels due to insufficient insulin production or ineffective use of insulin.
- **Conclusion**: This pair is correctly matched.

### Step 2: Analyze the second pair - Glucagon and Beta Cells
- **Explanation**: Glucagon is a hormone that raises blood glucose levels and is secreted by the alpha cells of the islets of Langerhans in the pancreas. Beta cells, on the other hand, secrete insulin.
- **Conclusion**: This pair is incorrectly matched because glucagon is not secreted by beta cells; it is secreted by alpha cells.

### Step 3: Analyze the third pair - Somatostatin and Delta Cells
- **Explanation**: Somatostatin is a hormone that regulates various bodily functions and is secreted by delta cells (D cells) found in the pancreas, stomach, and intestines.
- **Conclusion**: This pair is correctly matched.

### Step 4: Analyze the fourth pair - Corpus Luteum and Relaxin
- **Explanation**: The corpus luteum is a hormone-secreting structure in the ovary that produces relaxin, which plays a role during pregnancy.
- **Conclusion**: This pair is correctly matched.

### Final Conclusion
After analyzing all pairs, the incorrectly matched pair is **Glucagon and Beta Cells**.