Which of the following gland produces all polypeptide hormones ?

Options

A. Adrenal gland
B. Ovary
C. Pituitary gland
D. Thyroid gland

Answer

To determine which gland produces all polypeptide hormones, we will analyze each of the options provided: adrenal gland, ovary, pituitary gland, and thyroid gland.

### Step-by-Step Solution:

1. **Identify the Hormones Produced by Each Gland**:
- **Adrenal Gland**: The adrenal gland consists of two parts: the adrenal cortex and adrenal medulla. The hormones produced here include corticosteroids (such as glucocorticoids and mineralocorticoids) which are steroid hormones, not polypeptide hormones.
- **Ovary**: The ovaries primarily produce estrogen and progesterone, which are also steroid hormones. Therefore, they do not produce polypeptide hormones.
- **Pituitary Gland**: The pituitary gland produces several hormones, including luteinizing hormone (LH), follicle-stimulating hormone (FSH), adrenocorticotropic hormone (ACTH), thyroid-stimulating hormone (TSH), antidiuretic hormone (ADH), and oxytocin. Most of these hormones are classified as polypeptide hormones.
- **Thyroid Gland**: The thyroid gland produces hormones such as thyroxine (T4) and triiodothyronine (T3), which are derived from the amino acid tyrosine and are not polypeptide hormones.

2. **Conclusion**:
After analyzing the hormones produced by each gland, we can conclude that the **pituitary gland** is the gland that produces all polypeptide hormones.

### Final Answer:
The gland that produces all polypeptide hormones is the **pituitary gland**.

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