Which of the following is not an endocrine gland ?

Options

A. Pituitary gland
B. Salivary gland
C. Parathyroid
D. Thyroid gland

Answer

To determine which of the following is not an endocrine gland, we need to understand the characteristics of endocrine glands and the functions of the options provided.

### Step-by-Step Solution:

1. **Understand the Definition of Endocrine Glands**:
- Endocrine glands are specialized organs that secrete hormones directly into the bloodstream. They do not have ducts, which is why they are also referred to as "ductless glands."

2. **Analyze the Options**:
- **Option 1: Pituitary Gland**:
- The pituitary gland is known as the "master gland" because it produces hormones that regulate many bodily functions, including growth and metabolism. Therefore, it is an endocrine gland.
- **Option 2: Salivary Gland**:
- The salivary gland secretes saliva, which contains digestive enzymes but does not produce hormones. It has ducts that carry saliva to the mouth, making it an exocrine gland.
- **Option 3: Parathyroid Gland**:
- The parathyroid glands secrete parathyroid hormone (PTH), which regulates calcium levels in the blood. This makes it an endocrine gland.
- **Option 4: Thyroid Gland**:
- The thyroid gland produces hormones such as thyroxine (T4) and triiodothyronine (T3), which are crucial for metabolism. Thus, it is also an endocrine gland.

3. **Identify the Exception**:
- From the analysis, the salivary gland is the only option that does not secrete hormones and is not an endocrine gland. It is an exocrine gland.

4. **Conclusion**:
- Therefore, the answer to the question "Which of the following is not an endocrine gland?" is **Option 2: Salivary Gland**.

### Final Answer:
**Option 2: Salivary Gland**

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