Which one of the following part is an endocrine gland?

Options

A. Pars radiate
B. Brunner's glands
C. Juxtaglomerulus
D. Crypts of Lieberkuhn

Answer

To determine which of the given options is an endocrine gland, we need to understand the characteristics of endocrine glands and analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Endocrine Glands**:
- Endocrine glands are ductless glands that secrete hormones directly into the bloodstream. These hormones act as signaling molecules that regulate various physiological processes in the body.

2. **Analyzing the Options**:
- **Option 1: Parse Radiate**:
- This structure is involved in the radial conduction of water, minerals, and organic substances. It does not secrete hormones, so it is not an endocrine gland.
- **Option 2: Burner's Gland**:
- Burner's gland secretes mucous and alkaline fluids, which contain proteolytic enzymes. This secretion is not hormonal, thus it is not classified as an endocrine gland.
- **Option 3: Ranin**:
- Ranin is a hormone that stimulates the formation of angiotensin, which in turn stimulates the secretion of aldosterone from the adrenal cortex. Aldosterone is a hormone that regulates salt and water balance in the blood, indicating that Ranin is indeed part of an endocrine function.
- **Option 4: Crypts of Liberkohan**:
- These structures secrete antibacterial lysozyme, which is an enzyme and not a hormone. Therefore, they do not qualify as an endocrine gland.

3. **Conclusion**:
- Based on the analysis, the correct answer is **Option 3: Ranin**, as it is associated with the secretion of hormones and is part of the endocrine system.

### Final Answer:
**Option 3: Ranin** is the correct answer as it is an endocrine gland.

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