Functions of oxytocin is/are

Options

A. Smooth muscle contraction
B. Contraction of uterus
C. Milk ejection
D. All of the above

Answer

### Step-by-Step Solution:

1. **Definition of Oxytocin**: Oxytocin is a hormone produced in the hypothalamus and secreted by the pituitary gland. It plays a crucial role in various physiological processes.

2. **Production and Secretion**: Oxytocin is synthesized in the hypothalamus and then transported to the posterior pituitary gland, where it is stored and released into the bloodstream.

3. **Role in Female Reproductive Functions**: Oxytocin is particularly important in female reproductive functions, including sexual activity, childbirth, and breastfeeding.

4. **Function during Labor**: During childbirth, oxytocin stimulates the contraction of the smooth muscles in the uterus. This increase in uterine contractions helps facilitate the delivery of the baby.

5. **Role in Lactation**: Oxytocin also plays a significant role in lactation. It is responsible for the milk ejection reflex, allowing for the release of milk from the mammary glands during breastfeeding.

6. **Conclusion**: The functions of oxytocin include stimulating uterine contractions during labor and facilitating milk ejection during breastfeeding. Therefore, all options related to these functions are correct.