The chemical messengers produced in ductless glands are called:

Options

A. Lipids
B. Cellular membrane
C. Hormones
D. Antibodies

Answer

**Step-by-Step Solution:**

1. **Understanding Ductless Glands**: Ductless glands, also known as endocrine glands, are glands that release their secretions directly into the bloodstream rather than through ducts.

2. **Identifying Chemical Messengers**: The substances produced by these glands are responsible for regulating various physiological processes in the body. These substances are known as chemical messengers.

3. **Recognizing the Types of Chemical Messengers**: The primary type of chemical messenger produced by ductless glands is hormones. Hormones are specific molecules that travel through the bloodstream to target organs, where they elicit specific responses.

4. **Examples of Hormones**: Some common examples of hormones include:
- Growth Hormone (GH) from the pituitary gland, which stimulates growth.
- Thyroid Stimulating Hormone (TSH) from the pituitary gland, which stimulates the thyroid gland.
- Insulin from the pancreas, which regulates blood sugar levels.

5. **Conclusion**: Therefore, the chemical messengers produced in ductless glands are called hormones.

**Final Answer**: Hormones

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