Insulin, a peptide hormone like glucagon, has all the following effects except

Options

A. Insulin acts mainly on hepatocytes and adipocytes and enhances cellular glucose uptake and utilization
B. Insulin causes a rapid movement of glucose from blood to hepatocytes and adipocytes
C. Insulin is hypoglycemic factor
D. Insulin reduces glycogenesis

Answer

To answer the question regarding the effects of insulin, we will analyze the functions of insulin and identify which statement does not align with its known effects.

### Step-by-Step Solution:

1. **Understanding Insulin's Role**: Insulin is a peptide hormone produced by the pancreas. Its primary role is to regulate blood glucose levels.

2. **Effects of Insulin**:
- **Enhances Glucose Uptake**: Insulin facilitates the uptake of glucose by cells, particularly in the liver (hepatocytes) and fat (adipocytes) tissues.
- **Decreases Blood Glucose Levels**: By promoting glucose uptake, insulin lowers the concentration of glucose in the bloodstream, which is why it is referred to as a hypoglycemic hormone.
- **Promotes Glycogenesis**: Insulin stimulates the conversion of glucose to glycogen, which is stored in the liver and muscle cells. This process is known as glycogenesis.
- **Stimulates Lipogenesis**: Insulin also promotes the storage of fats in adipose tissue.

3. **Identifying the Incorrect Statement**: The question asks for the effect that insulin does not have. Based on the effects listed:
- Insulin does **not** decrease glycogenesis; rather, it increases glycogenesis by converting glucose to glycogen.

4. **Conclusion**: The statement that insulin decreases glycogenesis is incorrect. Therefore, this is the exception among the listed effects of insulin.

### Final Answer:
Insulin has all the following effects except **decreasing glycogenesis**.

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