Mitochondria perform functions beyond energy production, such as interacting with other organelles like the endoplasmic reticulum.

“They do lots of other things and and my interpretation is that in the afternoon well the standard lab joke is they're doing the ironing. They're doing other things that as organels they need to do. >> They are over a period of a day they're making contact with other organels in the cell particularly something called the endopplasmic reticulum. They're junctioning with that.”