Why is the mitochondrion known as the "power house" of a cell?

Mitochondria are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell.

Explanation: i did this

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the mitochondrian is the cell organelle in which cellular respiration takes place and energy is produced during cellular respiration by break down of glucose in presence of oxygen to for energy units known as ATP ( adinosine tri - phosphate) molecule.

since it produces energy it is known as powerhouse of the cell.

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periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.