Which of the following is the function of insulin ?

Options

A. Promote synthesis of fats from glucose by adipose tissue
B. Promote protein synthesis by promoting uptaking aminoacids by liver and muscle cells
C. Promote conversion of glucose into glycogen
D. All of these

Answer

To determine the function of insulin, we can analyze its roles in the body step by step.

### Step-by-Step Solution:

1. **Understanding Insulin**: Insulin is a peptide hormone composed of two peptide chains (A and B) totaling 51 amino acids. It is produced by the beta cells of the islets of Langerhans in the pancreas.

**Hint**: Remember that insulin is a hormone that plays a crucial role in glucose metabolism.

2. **Role of Insulin in Blood Sugar Regulation**: Insulin is primarily responsible for regulating blood glucose levels. When blood glucose levels rise (e.g., after eating), insulin is secreted to help lower these levels.

**Hint**: Think about how the body responds to high sugar intake.

3. **Conversion of Glucose to Glycogen**: One of the main functions of insulin is to promote the conversion of glucose into glycogen, which is stored in the liver and muscle cells. This process is known as glycogenesis.

**Hint**: Focus on how the body stores excess glucose.

4. **Other Functions of Insulin**: While insulin does have roles in fat and protein metabolism, its primary function in the context of the question is to lower blood glucose levels by converting glucose to glycogen. It does not primarily promote fat synthesis or protein synthesis.

**Hint**: Consider which functions are most directly related to glucose metabolism.

5. **Conclusion**: Based on the analysis, the correct answer to the question regarding the function of insulin is that it promotes the conversion of glucose into glycogen. Therefore, the answer is not "all of these," as insulin does not primarily promote fat or protein synthesis.

**Hint**: Summarize the main function of insulin in relation to glucose.

### Final Answer:
The function of insulin is to promote the conversion of glucose into glycogen.