Vitamin D is synthesized in the skin when the body is exposed to sunlight. Direction for question

Answer

### Step-by-Step Solution:

1. **Understanding the Role of Sunlight**:
- Vitamin D is synthesized in the skin when it is exposed to sunlight. This means that sunlight is essential for the production of Vitamin D in our bodies.

2. **Source of Vitamin D**:
- The primary source of Vitamin D is sunlight. Specifically, ultraviolet (UV) rays from the sun trigger the synthesis of Vitamin D in the skin.

3. **Importance of Vitamin D**:
- Vitamin D plays a crucial role in the absorption of calcium in the body. Calcium is vital for maintaining strong bones and overall health.

4. **Consequences of Vitamin D Deficiency**:
- If the body lacks Vitamin D, it cannot effectively absorb calcium. This deficiency can lead to several health issues, including:
- Rickets (a condition that affects bone development in children)
- Weak bones
- Bow legs

5. **Chemical Reaction in the Skin**:
- The synthesis of Vitamin D occurs through a chemical reaction in the epidermis (the outer layer of skin) when UV rays are absorbed. This reaction is essential for converting the inactive form of Vitamin D into its active form.

6. **Conclusion**:
- To maintain healthy levels of Vitamin D and ensure proper calcium absorption, it is important to get adequate sunlight exposure.