Choose and mark the correct statement in relation to the human endocrine system.

Options

A. Adenohypophysis is under direct neural regulation of the hypothalamus
B. Organs in the body like gastrointestinal tract, heart, kidney and liver do not produce any hormones
C. Non-nutrient chemicals produced by the body in trace amount that act as intercellular messenger are known as hormones
D. Releasing and inhibitory hormones are produced by the pituitary gland

Explanation

### Step-by-Step Solution:

1. **Read the Statements Carefully**: The question requires us to choose the correct statement regarding the human endocrine system. We need to analyze each statement one by one.

2. **Evaluate Statement 1**:
- The first statement claims that "adenohypophysis is under the direct neural regulation of the hypothalamus."
- **Analysis**: The adenohypophysis (anterior pituitary) is regulated by releasing and inhibitory hormones from the hypothalamus, but it is not under direct neural control. The neurohypophysis (posterior pituitary) is the part directly controlled by neural signals from the hypothalamus.
- **Conclusion**: This statement is incorrect.

3. **Evaluate Statement 2**:
- The second statement asserts that "organs in the body like GIT, kidney, and liver do not secrete any hormones."
- **Analysis**: This is false because organs such as the gastrointestinal tract (GIT) secrete hormones like secretin and gastrin, the kidneys secrete renin and erythropoietin, and the liver also produces hormones.
- **Conclusion**: This statement is incorrect.

4. **Evaluate Statement 3**:
- The third statement states that "non-nutrient chemicals produced by the body in trace amounts act as intercellular messengers and are known as hormones."
- **Analysis**: This is a correct definition of hormones. Hormones are indeed non-nutrient chemicals produced in small amounts that facilitate communication between cells.
- **Conclusion**: This statement is correct.

5. **Evaluate Statement 4**:
- The fourth statement claims that "the releasing and the inhibitory hormones are produced by the pituitary gland."
- **Analysis**: This is incorrect because releasing and inhibitory hormones are produced by the hypothalamus, not the pituitary gland itself.
- **Conclusion**: This statement is incorrect.

6. **Final Conclusion**: After evaluating all the statements, the only correct statement is the third one, which defines hormones accurately.

### Final Answer:
The correct statement in relation to the human endocrine system is: **"Non-nutrient chemicals produced by the body in trace amounts act as intercellular messengers and are known as hormones."**

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