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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
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Mitochondria are the small, spherical or cylindrical organelles.Generally a mitochondrion is 2-8 micron long and 0.5 micron wide .It's about 150 times smaller than the nucleus. There are about 100-150 mitochondria in each cell .when seen under compound microscope, the mitochondria appears as oval or cylindrical dots in cell .If we observe through electron microscope, we can observe that mitochondria has double membrane wall. The inner membrane of the wall protrudes into the interior in folds and forms structure called cristae; the space between cristae is called matrix. Mitochondria are responsible for cellular respiration a process through which the cells derives it's energy to do work.Because of this mitochondria are also known as the power house of cell.
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