 cytoplasmic organelle is the mitochondria first the contents definition of mitochondria structure of mitochondria and role of mitochondria in the cell first the definition the mitochondria are double membrane bounded structures present in cytoplasm and they are involved in ATP production energy production so mitochondricogram making they are one of the very important organelle of the cell cell the energy requirements in the cell are usually maximum mitochondria are fulfilled whereas if we look at the number of mitochondria the cells in which there are more energy requirements means those cells which they have to work extensively they have more number of mitochondria and those cells in which they have to work a little less or in which biochemical activities work the number of mitochondria is less for example the cells of our earlobes the cells of earlobes which are not particularly useful for contraction neither biochemical activities which they do more because of this the number of mitochondria will be few in the cells of earlobes a few mitochondria will be present in a cell whereas if we talk about the liver cells our liver cells they are working very extensively the liver cells work very extensively so their energy requirements are also very high now to fulfill that energy requirement the number of mitochondria in the liver cell where it is multiple it may be up to one thousand so the number of mitochondria in one cell is close to one thousand because the more the mitochondria the more the cell will get more energy and accordingly it will also work more structure of mitochondria if we look at the mitochondria overall if we look at its physical appearance it may be circular slightly elongated or it can be a rod shape so then we simply say that it can go from circular to elongated form i.e. circular, semi-circular i.e. sort of basvy shape or rod shape that are mitochondria depends on which cell is present cell to cell their shape it varies mitochondria are double membrane structures outer membrane where it is in a continuation and that is smooth that is a flattened form outer mitochondrial membrane is flat and smooth in appearance inner mitochondrial membrane and under the outer there is inner mitochondrial membrane that is highly folded so inner mitochondrial membrane is in the folded form and between outer and inner mitochondrial membrane there is space which we call inter-membrane space okay you don't need to be at your level but the space between the two is called inter-membrane space in the same way the mitochondria's inner mitochondrial membrane is its folds when the mitochondrial membrane folds it makes a finger-like projection in the mitochondria and they are called as the Christi this means that in the mitochondria the inner mitochondrial membrane makes finger-like projections and we give them the name Christi matrix in the inner mitochondrial membrane the cavity of the mitochondria is called as its matrix now this means that if in the mitochondria there are different types of proteins glucose or any ATP molecules or fatty acids whatever is in the mitochondria is called as the mitochondria matrix so in the matrix of the mitochondria the mitochondria is an organelle which replicates itself and increases its number means if the cell divides it can divide the mitochondria itself so when the cell needs it it enhances its number of mitochondria and increases it now the mitochondria replicates itself because it has its DNA so in addition to its DNA, the mitochondria has its ribosomes for protein synthesis the ribosomes are different from the cytoplasm that are of the cell in the mitochondria there are ribosomes that are present which are slightly different from the cell or cytoplasm ribosomes then the structure of the ribosome is the mitochondria if we look at the structure of the mitochondria this is the outer membrane the outer membrane which is a slightly transparent form as you can see it is smooth, it is flattened and the outer membrane is smooth if you look at the inner mitochondria membrane you can see that it is a folded form the inner mitochondria membrane is highly folded the space between the outer and the inner mitochondria membrane that is called inter membrane space in addition to this the inner mitochondria membrane is forming finger-like projections these finger-like projections are called as the Christi that is why we give the name of Christi this is a Christi, this is Christi so those are the many Christi that are present in the inner mitochondria membrane after that, the Leumann is called cavity what we call the cavity in the mitochondria whatever material is present in it, that is called the matrix so this is the overall structure of the mitochondria here the ribosomes and DNA which are very small molecules that we are not showing for diagrammatically the role of mitochondria in the cell if you look at the role of the mitochondria in the cell they are very prime importance in the cell they are actually the powerhouse of the cell the way the car runs with the engine the engine is in the petrol, if the engine runs it will get energy the entire car will work same as the case, in a cell the mitochondria is the powerhouse of the cell the powerhouse of the cell is called the power generator all the ATPs will mostly produce the mitochondria and all the other organelles on the ATP mitochondria are from the nucleus, the cell membrane, the Golgioprotus, the endoplasmic reticle all the organelles that have the energy are transported from the mitochondria now for the energy production there are some metabolic pathways that are present in the mitochondria in that we have the lipid metabolism the oxidation of the fatty acid instead of lipid metabolism, if we talk directly, we would say fatty acid oxidation, the breakdown of the fatty acid this is a crab cycle electron transport chain all these are the mechanisms that ultimately need to be produced by the ATP and this is the ATP that the cell will utilize