Sweet glands are : -

Options

A. Merocrine
B. Endocrine
C. Holocrine
D. Unicellular

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the type of glands that sweat glands belong to.

2. **Analyzing the Options**: We have four options to consider:
- A) Merocrine
- B) Endocrine
- C) Holocrine
- D) Unicellular

3. **Evaluating Option A - Merocrine**:
- Merocrine glands are a type of exocrine gland that secrete their products via secretory vesicles through a process called exocytosis.
- Sweat glands are known to function this way, as they release sweat through the skin without losing any cellular material.
- Therefore, this option is correct.

4. **Evaluating Option B - Endocrine**:
- Endocrine glands release their hormones directly into the bloodstream rather than through ducts.
- Examples include the thyroid and pituitary glands.
- Since sweat glands do not function this way, this option is incorrect.

5. **Evaluating Option C - Holocrine**:
- Holocrine glands release their secretion by rupturing the entire cell, leading to cell death.
- An example of this type is sebaceous glands (oil glands).
- Sweat glands do not operate in this manner, making this option incorrect.

6. **Evaluating Option D - Unicellular**:
- Unicellular glands consist of a single cell that secretes substances.
- Sweat glands are multicellular and thus do not fit this classification. Therefore, this option is also incorrect.

7. **Conclusion**: After evaluating all options, the correct answer is A) Merocrine, as sweat glands are classified as merocrine glands.