What is osteoporosis? Name two factors responsible for this condition.

Explanation

### Step-by-Step Solution:

1. **Definition of Osteoporosis**: Osteoporosis is a medical condition characterized by the weakening of bones, which leads to an increased risk of fractures. This weakening is primarily due to a decrease in bone density.

2. **Understanding Bone Density**: Bone density refers to the amount of mineral matter per square centimeter of bone. In osteoporosis, there is a continuous loss of essential minerals, particularly calcium and phosphorus, from the bones, which results in lower bone density.

3. **Factors Responsible for Osteoporosis**:
- **Factor 1: Age**: As individuals age, hormonal changes occur, particularly in sex hormones and parathyroid hormones. These hormones play a crucial role in maintaining calcium levels in the body. An imbalance in these hormones can lead to increased calcium loss from the bones, contributing to osteoporosis.
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