Hormone is a /an

Options

A. Enzyme
B. Chemical messenger
C. Excretory product
D. Glandular secretion

Answer

**Step-by-Step Solution:**

1. **Definition of Hormones**: Begin by understanding what hormones are. Hormones are chemical or signaling molecules that are secreted by endocrine glands into the bloodstream. They travel to target organs to regulate and alter their functioning.

2. **Analyzing the Options**:
- **Enzyme**: Enzymes are biocatalysts that speed up chemical reactions without being consumed in the process. They do not function as hormones, so this option is incorrect.
- **Chemical Messenger**: Hormones act as chemical messengers in the body, transmitting signals to various organs to elicit a response. This option is correct.
- **Excretory Product**: Excretory products are waste substances formed from metabolic processes that are typically eliminated from the body. Hormones are not classified as excretory products, making this option incorrect.
- **Glandular Secretion**: While hormones are secretions from glands, the term "glandular secretion" encompasses both endocrine and exocrine secretions. Since hormones specifically refer to secretions from endocrine glands, this option is also incorrect.

3. **Conclusion**: After evaluating all the options, the correct classification for hormones is that they are **chemical messengers** in the body.

**Final Answer**: Hormone is a **chemical messenger**.

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