https://i0.wp.com/www.sciencebold.com/wp-content/uploads/2011/11/mitochondrion_000.jpg?fit=800%2C641 641 800 admin http://www.sciencebold.com/wp-content/uploads/2016/07/Untitled-300x114.png admin2011-11-28 14:02:002016-09-16 08:28:06Mitochondria
Mitochondria are virtually present in all the aerobic cells. It is absent in bacteria, other prokaryotic cells and mature blood cells of the multicellular organism. It was first observed as granule like structures in the muscle cell of insect in 1880 by Kollikar. In 1897, Benda observed similar objects in cell and assigned the name mitochondria. Hageboom(1948) has reported that mitochondria are the chief sites for cellular respiration.
Shape and size of mitochondria
They are very small, colorless living bodies present in the cytoplasm of plant and animal cells. They may be spherical, rod shaped or oval. They may change from one form to another depending upon the physiological condition of the cells. They usually measure about 0.5 – 1µ in diameter and reach length up to 40µ.
They are composed of double layered membrane of lipoprotein. The outer membrane possesses particles of protein.