Given the specific terms of the
Extensive infolding to the inner membrane of mitochondria

Explanation

### Step-by-Step Solution:

1. **Understanding Mitochondria Structure**:
- Mitochondria are double-membraned organelles found in eukaryotic cells. They consist of an outer membrane and an inner membrane.
- The outer membrane is smooth, while the inner membrane has extensive infoldings.

2. **Identifying the Infoldings**:
- The extensive infoldings of the inner membrane of mitochondria are crucial for their function.
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