If all the cells in any gland are secretory, the gland is :

Options

A. Option1 Holocrine
B. Option2 Apocrine
C. Option3 Merocrine
D. Option4 Heterocrine

Answer

To determine the type of gland where all the cells are secretory, we need to analyze the options provided:

1. **Halocrine Gland**: These glands release their entire cell contents by rupturing the cell. This means that all the cells in halocrine glands are indeed secretory, as they contribute their entire contents to the secretion. Examples include sebaceous glands of the skin and meibomian glands of the eyelids.

2. **Apocrine Gland**: These glands lose small portions of their glandular cell bodies during secretion. This indicates that not all parts of the cell are secretory, as only a portion is released. Examples include mammary glands and axillary sweat glands.

3. **Mirocrine Gland**: These glands release their secretions via exocytosis, where fluid products are secreted from the cells into ducts and then to a bodily surface or lumen. This means that not all cells are fully secretory, as they do not release the entire cell contents. Examples include sweat glands and salivary glands.

4. **Heterocrine Gland**: These glands function as both exocrine and endocrine glands. This means they have both secretory and non-secretory functions, so not all cells are secretory. Examples include the liver and pancreas.

Based on this analysis, the correct answer is:

**Halocrine Gland** - because all the cells in this type of gland are secretory, releasing their entire contents.

### Step-by-Step Solution:
1. **Understand the question**: Identify what type of gland has all cells as secretory.
2. **Analyze each option**:
- **Halocrine Gland**: Entire cell contents released; all cells are secretory.
- **Apocrine Gland**: Only portions of cells are secreted; not all cells are secretory.
- **Mirocrine Gland**: Fluid products released via exocytosis; not all cells are secretory.
- **Heterocrine Gland**: Functions as both exocrine and endocrine; not all cells are secretory.
3. **Identify the correct option**: Halocrine gland is the only type where all cells are secretory.

### Final Answer:
**Halocrine Gland**