Differentiate between Merocrine, Apocrine and Holocrine glands.

Explanation

### Step-by-Step Text Solution:

1. **Definition of Glands**: Glands are specialized structures in the body that produce and secrete substances such as hormones, enzymes, or other fluids.

2. **Merocrine Glands**:
- **Secretion Mechanism**: In merocrine glands, secretion occurs via exocytosis. The secretory vesicles release their contents without any loss of cellular material.
- **Cellular Integrity**: The glandular cells remain intact and are not damaged during the secretion process.
- **Examples**: Salivary glands and sweat glands are typical examples of merocrine glands.
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