Question

What does the mitochondria do in a cell¿

Answer 1

i believe it acts as a digestive system for the cell..

Answer 2

http://www.newcastle-mitochondria.com/mitochondria/what-do-mitochondria-do/
This will help you a lot.

Answer 3

its basically the "powerhouse" it breaks down things for energy

Answer 4

Just like needbiohelp says, it produce "energy", in addition it contains bacterial DNA, suggesting that it was once foreign to the body, although throughout the process of many years, our bodies changed it and adapted it to what is know called today a "mitochondria".