Hormones are :

Options

A. Produced in low amount
B. Easily diffusable
C. Non -antigenic
D. All

Answer

### Step-by-Step Solution:

1. **Definition of Hormones**:
- Hormones are defined as non-nutrient chemicals that serve as intracellular messengers in the body. They are crucial for various physiological processes.

2. **Production of Hormones**:
- Hormones are produced in trace amounts, meaning they are synthesized in very small quantities compared to other substances in the body.

3. **Characteristics of Hormones**:
- Hormones are easily diffusible, allowing them to move quickly through the bloodstream to reach their target organs or tissues.
- They are non-antigenic, which means they do not trigger an immune response. This characteristic is important for their function as they need to operate without interference from the immune system.

4. **Secretion of Hormones**:
- Hormones are secreted by ductless glands known as endocrine glands. These glands release hormones directly into the bloodstream rather than through ducts.

5. **Targeting Mechanism**:
- Hormones exert their effects by binding to specific receptors located on the cells of their target organs. This binding initiates a response that leads to the desired physiological effect.

6. **Conclusion**:
- In summary, hormones are non-nutrient chemicals produced in trace amounts, easily diffusible, non-antigenic, and act on specific target cells through receptor binding.