Specific opioid receptors are present in

Options

A. ANS only
B. Gastrointestinal tract only
C. CNS and gastrointestinal tract
D. Damaged or injured organs

Answer

To solve the question "Specific opioid receptors are present in," we need to analyze the options provided:

1. **Understanding Opioid Receptors**: Opioid receptors are proteins found in the body that bind to opioids, which are substances that can relieve pain. They are part of the body's pain control system.

2. **Analyzing the Options**:
- **Option A: ANS only** - The Autonomic Nervous System (ANS) does have some opioid receptors, but they are not limited to this system.
- **Option B: Gastrointestinal tract only** - While opioid receptors are present in the gastrointestinal tract, they are not exclusive to it.
- **Option C: CNS and gastrointestinal tract only** - The Central Nervous System (CNS), which includes the brain and spinal cord, has a significant presence of opioid receptors, and they are also found in the gastrointestinal tract.
- **Option D: Damaged or injured organs** - While opioid receptors may be involved in the response to injury, they are not specifically present only in damaged organs.

3. **Conclusion**: Based on the analysis, the most accurate answer is **Option C: CNS and gastrointestinal tract only**. This is because opioid receptors are indeed found in both the brain and spinal cord (CNS) as well as in the digestive system.

**Final Answer**: Option C: CNS and gastrointestinal tract only.

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