The hormone oxytocin and vasopressin are secreted by :

Options

A. Neurohypophysis
B. Adenohypophysis
C. Hypothalamus
D. Adrenal medulla

Answer

**Step-by-Step Solution:**

1. **Understand the Question**: The question asks which gland secretes the hormones oxytocin and vasopressin.

2. **Identify the Hormones**:
- Oxytocin is known for stimulating uterine contractions during childbirth.
- Vasopressin (also known as antidiuretic hormone, ADH) helps in reducing water loss during urination.

3. **Consider the Options**:
- Option 1: Neurohypophysis (posterior lobe of the pituitary gland)
- Option 2: Adenohypophysis (anterior lobe of the pituitary gland)
- Option 3: Hypothalamus
- Option 4: Adrenal Medulla

4. **Analyze Each Option**:
- **Neurohypophysis**: This is the posterior lobe of the pituitary gland and is responsible for the secretion of oxytocin and vasopressin. This option is correct.
- **Adenohypophysis**: This is the anterior lobe of the pituitary gland, which secretes different hormones such as FSH, LH, and GH. This option is incorrect.
- **Hypothalamus**: While it produces oxytocin and vasopressin, these hormones are stored and released from the neurohypophysis. Thus, this option is not the direct source of secretion. This option is incorrect.
- **Adrenal Medulla**: This part of the adrenal gland secretes adrenaline and noradrenaline, not oxytocin or vasopressin. This option is incorrect.

5. **Conclusion**: The correct answer is **Neurohypophysis** (Option 1), as it is responsible for the secretion of both oxytocin and vasopressin.

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