Give reasons why mitochondria are called 'power houses' and ATP as 'energy currency' of the cell.

Explanation

### Step-by-Step Solution:

1. **Understanding Mitochondria**:
- Mitochondria are organelles found in the cells of most eukaryotic organisms. They are often referred to as the "powerhouses" of the cell.

2. **Reason for the Name 'Powerhouse'**:
- Mitochondria are called the "powerhouses" of the cell because they are the primary site for the process of cellular respiration.
- During cellular respiration, mitochondria oxidize nutrients (primarily carbohydrates) in the presence of oxygen. This process releases energy.
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