The mitochondria (singular:Mitochondrion ) are tiny bodies of varying shapes (cylindrical,rod-shaped,spherical) and size (0.2 mm to 2 mm ), distributed in the cytoplasm.Each mitochondrion is bounded by a double membrane envelope.Outer membrane is Porous. The inner membrane is thrown into folds.
Mitochondria are sites of cellular respiration. They use molecular oxygen from air to oxidize the carbohydrates and fats present in the cell to carbon dioxide and water vapour. The mitochondria-associated ER membrane (MAM) is another structural element that is increasingly recognized for its critical role in cellular physiology and homeostasis.
They are known as "The Power House Of The Cell" as it synthesize energy rich compounds that are ATP (Adenosine Triphosphate)