Give the site of secretion and the function of relaxin.

Explanation

### Step-by-Step Solution:

1. **Identify the Site of Secretion**:
- Relaxin is primarily secreted by the **corpus luteum**. The corpus luteum is formed from the remnants of the Graafian follicle after the ovulation of the secondary oocyte.

2. **Understand the Function of Relaxin**:
- The primary function of relaxin is to **relax the muscles of the uterus**. This relaxation is crucial for accommodating the growing fetus during pregnancy and plays a significant role during **parturition** (the process of giving birth).

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