Because they are very active. They need a lot of energy.
Cells don't store energy. They make it as they need it.
glycogen
a muscle cell will need alot of mitochondria for energy as it uses up a lot when the muscle contracts and relaxes rapidlyAny cells which would require a great deal of energy to fulfill their function, such as muscles.
Plant cells synthesize their food by photosynthesis. Animal cells can not do like plants, so it needs to be taken.Digestion of food molecules will help the cells to make energy(ATP).
Energy....
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They both have mitochondria
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as an energy source like we do
mitochondria supply the energy to the cells. Muscle cells require a lot of energy for contraction. Therefore muscle cells need a lot of mitochondria.
Cells that require a lot of energy to carry out their functions, such as muscle cells and nerve cells, tend to have a high concentration of mitochondria. Muscle cells, for example, require a lot of energy to contract and relax, so they have a high density of mitochondria to produce the ATP (adenosine triphosphate) required for energy. Similarly, nerve cells require a lot of energy to transmit signals along their length, so they also have a high concentration of mitochondria. Other cells that have a high density of mitochondria include liver cells, which have a lot of metabolic processes, and kidney cells, which require a lot of energy to carry out their filtration function.
Because they are very active. They need a lot of energy.
Cells that require a lot of energy for daily activities, such as muscle cells.
Heart is a very active organ. It functions through out the life. It needs a lot of energy.