All cellular respiration occurs in mitochondria .We know that respiration is the breakdown of simpler organic material i.e glucose breakdown into carbon-dioxide and energy .so in mitochondria respiration takes place which produce the energy .That is why it also called as power house of the cell.
1. Mitochondria possess oxysomes on its inner membrane.
2.These oxysomes take active part in synthesis of ATP molecular.
3.They play an important role in cellular activities.
4.During cellular respition, ATP molecular are produced and get accumulated in the mitochondria.