A hormone secreted by non endocrine tissue is

Options

A. Insulin like growth factor (IGF)
B. Calcitriol
C. Cytokine
D. Enzyme

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a hormone that is secreted by non-endocrine tissue. This means we need to identify a substance from the options provided that functions as a hormone but is produced outside of traditional endocrine glands.

2. **Analyzing the Options**:
- **Insulin-like Growth Factor (IGF)**: This is a hormone that promotes growth and development, particularly in bones and tissues. It is secreted by the liver and skeletal muscles in response to growth hormone stimulation.
- **Calcitriol**: This is a form of vitamin D that helps the body utilize calcium but is not classified as a hormone in the same context as IGF.
- **Cytokine**: These are signaling molecules involved in immune responses, produced by immune cells like macrophages and lymphocytes, and are not hormones.
- **Enzyme**: Enzymes are biological catalysts produced by exocrine glands and are not classified as hormones.

3. **Identifying the Correct Answer**: Among the options, only insulin-like growth factor (IGF) is a hormone that is secreted by non-endocrine tissues (liver and skeletal muscles), making it the correct answer.

4. **Conclusion**: The hormone secreted by non-endocrine tissue is **Insulin-like Growth Factor (IGF)**.

---