Which one of the following statements is correct?

Options

A. Endocrine galnds regulate neural activity. But not vice versa.
B. Neurons regulate endocrine activity, but not vice versa.
C. Endocrine glands regulate neural activity, and nervous system regulates endocrine glands.
D. Neither hormones control neutral activity nor the neurons control endocrine activity.

Explanation

To solve the question regarding which statement is correct among the given options, we need to analyze each statement in relation to the functions of the endocrine system and the nervous system.

### Step-by-Step Solution:

1. **Understanding the Systems**:
- The endocrine system consists of glands that secrete hormones into the bloodstream, which then travel to various organs and tissues to regulate bodily functions.
- The nervous system includes neurons that transmit signals rapidly across synapses to control body functions.

2. **Analyzing Each Statement**:
- **Statement 1**: "Endocrine glands regulate neural activity but not vice versa."
- This is incorrect because while endocrine glands can influence neural activity through hormones, the nervous system can also regulate endocrine glands.

- **Statement 2**: "Neurons regulate endocrine activity but not vice versa."
- This is also incorrect. Neurons can influence endocrine activity, but endocrine glands can also affect neural activity through the hormones they release.

- **Statement 3**: "Endocrine glands regulate neural activity and the nervous system regulates endocrine glands."
- This statement is correct. The endocrine glands do release hormones that can influence neural activity, and the nervous system, particularly through the hypothalamus, regulates the activity of endocrine glands.

- **Statement 4**: "Neither hormones control neural activity nor the neurons control endocrine activity."
- This statement is incorrect. There is a significant interaction between the two systems, where hormones can influence neural activity and vice versa.

3. **Conclusion**:
- The correct statement is **Statement 3**: "Endocrine glands regulate neural activity and the nervous system regulates endocrine glands."

### Final Answer:
The correct answer is **Option 3**.

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