Which one of the following part acts as an endocrine gland or tissue ?

Options

A. Pars radiate
B. JG cells
C. Brunner’s gland
D. Pancreactic acine

Answer

To determine which part acts as an endocrine gland or tissue, we need to analyze the options provided in the context of their functions and secretions.

### Step-by-Step Solution:

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

2. **Evaluating the Options**:
- **Option 1: JG Cells (Juxtaglomerular Cells)**:
- These cells are located in the kidneys and secrete the hormone erythropoietin (EPO), which stimulates the production of red blood cells (RBCs). Since they secrete a hormone directly into the blood, they function as an endocrine gland.

- **Option 2: Brunner's Glands**:
- Located in the duodenum (part of the small intestine), Brunner's glands secrete an alkaline fluid to neutralize stomach acid. They do not secrete hormones, so they do not function as an endocrine gland.

- **Option 3: Pancreatic Acini**:
- The pancreas has both endocrine and exocrine functions. The pancreatic acini are responsible for producing digestive enzymes (exocrine function), while the islets of Langerhans (endocrine part) secrete hormones like insulin and glucagon. However, the acini themselves do not act as an endocrine gland.

3. **Conclusion**:
- Among the options, only the JG cells of the kidneys act as an endocrine gland by secreting erythropoietin. Therefore, the correct answer is **Option 1: JG Cells**.