Which of the following endocrine gland's hormones binds to their specific receptors present inside the target cells to form hormone - receptor complex ?
(a) Pituitary hormones
(b) Adrenal medulla hormones
(c) Hypothamic hormones
(d) Adrenal cortex hormones

Options

A. Pituitary hormones
B. Adrenal medulla hormones
C. Hypothamic hormones
D. Adrenal cortex hormones

Answer

To solve the question regarding which endocrine gland's hormones bind to their specific receptors present inside the target cells to form a hormone-receptor complex, we can follow these steps:

### Step 1: Understand the Types of Hormone Receptors
Hormones can interact with two main types of receptors:
- **Cell Surface Receptors**: Located on the surface of the target cell. These receptors typically bind to peptide hormones and catecholamines.
- **Nuclear Receptors**: Located inside the target cell, often in the cytoplasm or nucleus. These receptors typically bind to steroid hormones and thyroid hormones.

### Step 2: Analyze Each Option
Now, let's analyze the options provided in the question:

1. **Pituitary Hormones**: These hormones (like ACTH, TSH, etc.) generally bind to cell surface receptors.
2. **Adrenal Medulla Hormones**: These hormones (like adrenaline and noradrenaline) also bind to cell surface receptors.
3. **Hypothalamic Hormones**: Similar to pituitary hormones, they bind to cell surface receptors.
4. **Adrenal Cortex Hormones**: These hormones (like cortisol and aldosterone) bind to nuclear receptors inside the target cells.

### Step 3: Identify the Correct Answer
From the analysis:
- Options A (Pituitary hormones), B (Adrenal medulla hormones), and C (Hypothalamic hormones) bind to cell surface receptors.
- Option D (Adrenal cortex hormones) binds to nuclear receptors inside the target cells.

Thus, the correct answer is **(d) Adrenal cortex hormones**.

### Step 4: Conclusion
The hormones from the adrenal cortex are the ones that bind to specific receptors located inside the target cells, forming a hormone-receptor complex.

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