Hormone that causes glycogenolysis and gluconeogenesis

Options

A. Aldosterone
B. Insulin
C. Glucagon
D. ACTH.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the hormone that is responsible for two specific processes: glycogenolysis and gluconeogenesis.

2. **Analyzing the Options**:
- **Aldosterone**: This hormone is secreted from the adrenal cortex and is primarily involved in regulating electrolyte balance, particularly sodium and potassium levels. It does not play a role in glycogenolysis or gluconeogenesis.
- **Insulin**: Secreted by the beta cells of the pancreas, insulin facilitates the uptake of glucose by cells and decreases blood glucose levels. It promotes the storage of glucose as glycogen rather than its breakdown, so it does not stimulate glycogenolysis or gluconeogenesis.
- **Glucagon**: This hormone is secreted by the alpha cells of the pancreas and has the opposite effect of insulin. It increases blood glucose levels by stimulating glycogenolysis (the breakdown of glycogen into glucose) and gluconeogenesis (the synthesis of glucose from non-carbohydrate sources).
- **ACTH (Adrenocorticotropic Hormone)**: This hormone is produced by the anterior pituitary gland and primarily stimulates the adrenal cortex to produce cortisol. It does not directly influence glycogenolysis or gluconeogenesis.

3. **Identifying the Correct Answer**: Based on the analysis, glucagon is the hormone that causes both glycogenolysis and gluconeogenesis, leading to an increase in blood glucose levels.

4. **Final Answer**: The hormone that causes glycogenolysis and gluconeogenesis is **glucagon**.

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