Which of the following is not an endocrine gland?

Options

A. Pancreas
B. Adrenal gland
C. Thyroid gland
D. Salivary gland

Answer

To determine which of the following is not an endocrine gland, we need to analyze each option provided:

1. **Pancreas**: The pancreas is a mixed gland, meaning it has both endocrine and exocrine functions. It secretes hormones like insulin and glucagon directly into the bloodstream (endocrine function) and also produces digestive enzymes that are released into the digestive tract (exocrine function). Therefore, the pancreas is considered an endocrine gland.

2. **Adrenal Gland**: The adrenal glands are purely endocrine glands. They produce hormones such as cortisol, aldosterone, and adrenaline, which are released directly into the bloodstream. Thus, the adrenal gland is an endocrine gland.

3. **Thyroid Gland**: The thyroid gland is also an endocrine gland. It produces hormones like thyroxine (T4) and triiodothyronine (T3), which are released into the bloodstream and regulate metabolism. Therefore, the thyroid gland is an endocrine gland.

4. **Salivary Gland**: The salivary glands are primarily exocrine glands. They secrete saliva, which contains enzymes and electrolytes, directly into the mouth through ducts. They do not release hormones into the bloodstream. Therefore, the salivary gland is not an endocrine gland.

Based on the analysis above, the answer to the question is:

**The salivary gland is not an endocrine gland.**

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