Which one of the following statements is correct?

Options

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

Answer

To determine which statement is correct regarding the relationship between the nervous system and the endocrine system, we can analyze each option step by step.

### Step-by-Step Solution:

1. **Analyze the First Statement**:
- The first statement claims that "neither hormones control neural activity nor the neuron control the endocrine activity."
- This is incorrect because hormones can influence neural activity, and neurons can also regulate endocrine activity.

**Hint**: Consider how hormones can affect mood and behavior, which are neural activities.

2. **Analyze the Second Statement**:
- The second statement asserts that "endocrine glands regulate neural activity but not vice versa."
- This is also incorrect because while endocrine glands can influence neural activity, the nervous system can also regulate the activity of endocrine glands.

**Hint**: Think about how stress (a neural response) can trigger the release of hormones from glands.

3. **Analyze the Third Statement**:
- The third statement states that "neurons regulate endocrine activity but not vice versa."
- This statement is incorrect as well, since endocrine glands can also influence neural activity.

**Hint**: Reflect on how hormones like adrenaline can affect the nervous system's response to stress.

4. **Analyze the Fourth Statement**:
- The fourth statement claims that "endocrine glands regulate neural activity and the nervous system also regulates the endocrine gland."
- This statement is correct because it acknowledges the bidirectional relationship between the nervous and endocrine systems.

**Hint**: Consider the concept of the neuroendocrine system, where both systems interact and influence each other.

### Conclusion:
The correct answer is **option 4**: "Endocrine glands regulate neural activity and the nervous system also regulates the endocrine gland."