explain the purpose of the membranes in the mitochondrion in small words

Mitochondria have two membranes, and each has an important job:

1. **Outer Membrane**: This is the smooth outside layer. It protects the inside of the mitochondrion and lets small molecules pass through.

2. **Inner Membrane**: This is folded into many squiggly shapes. These folds create small spaces where important chemical reactions happen. This is where the mitochondrion makes energy for the cell using food and oxygen.

Together, the membranes help the mitochondrion produce energy in a safe and efficient way.