Which of the following event after parturition ensure milk secretion :

Options

A. Increased estrogen
B. Increased oxytocin
C. Decreased oxytocin
D. Decreased estrogen and progesterone

Answer

To solve the question regarding which event after parturition ensures milk secretion, we can break down the information step by step.

### Step-by-Step Solution:

1. **Understanding Parturition**:
- Parturition refers to the process of childbirth. It involves various physiological changes and hormonal activities in the body.

**Hint**: Remember that parturition is the term used for childbirth.

2. **Hormonal Changes During Parturition**:
- During childbirth, strong contractions of the uterine muscles occur. These contractions are primarily stimulated by the hormone **oxytocin**.

**Hint**: Oxytocin is key in stimulating uterine contractions during childbirth.

3. **Role of Oxytocin**:
- Besides facilitating contractions, oxytocin also plays a crucial role in the secretion of milk. It is known as the **milk-secreting hormone**.

**Hint**: Think of oxytocin as both a contraction-inducing and milk-secreting hormone.

4. **Identifying the Correct Event**:
- The question asks which event after parturition ensures milk secretion. Among the options provided:
- Increase estrogen
- Increase oxytocin
- Decrease oxytocin
- Decrease estrogen and progesterone
- The correct answer is **increase oxytocin**, as it directly stimulates milk secretion.

**Hint**: Look for the hormone that is specifically linked to milk secretion after childbirth.

5. **Additional Information**:
- It is also important to note that while oxytocin is responsible for milk secretion, **prolactin** is the hormone responsible for the formation of milk.

**Hint**: Prolactin is related to milk production, while oxytocin is related to milk ejection.

### Final Answer:
The event after parturition that ensures milk secretion is **increase oxytocin**.