What is the function of oxytocin?

Explanation

### Step-by-Step Solution:

1. **Definition of Oxytocin**: Oxytocin is a hormone that is secreted by the posterior part of the pituitary gland, also known as the neurohypophysis.

2. **Control by Hypothalamus**: The secretion of oxytocin is under the direct control of the hypothalamus, which regulates its release into the bloodstream.

3. **Functions of Oxytocin**:
- **Milk Ejection**: One of the primary functions of oxytocin is to facilitate the ejection of milk from the mammary glands during lactation. This is particularly important after childbirth, as it helps in feeding the newborn.
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