Final answer:
Mitochondria are organelles that produce ATP through cellular respiration, serving as the cell's energy source.
Explanation:
Mitochondria are organelles responsible for producing ATP, the cell's energy source, through cellular respiration. They have their own DNA and play a crucial role in providing energy for cellular functions. The high concentration of mitochondria in muscle cells reflects their need for energy to contract efficiently.
Learn more about Mitochondria's function in cellular energy production here:
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