Liver is the largest internal organ of the body. It has many functions including metabolism. Metabolism and some other function require energy. This energy is provided by the liver mitochondria because the mitochondria are the power house of energy. Liver cells have maximum number of mitochondria (1000-2000 per cell). The enzymes in the liver cell mitochondria help in detoxifying ammonia which is produce as wast product of metabolism. This is the reason that liver cells have high number of mitochondria.
Yes, the liver is the site of many chemical reactions like the conversion of ammonia to urea, as well as being involved in releasing many hormones such as insulin, and glycagon. All this requires energy. Mitochondria, via cellular respiration create ATP from glucose and other substrates, which the liver can use as energy to produce its products, and to transport them from itself, into the blood and to other cells...
Mitochondria can be seen as "cellular power plants" because of its main function is to generate the energy of oxidation of organic matter into ATP, aerobic respiration produces the energy of the main site.In the cytoplasm, mitochondria are often concentrated in the metabolism of active regions, because these areas need more ATP, such as muscle cells, there are many mitochondria in muscle fibers. In addition, sperm cell, flagella, cilia, and renal tubular cells, mitochondria are the base of the distribution of more places.