mitochondria
ribosomes
endoplasmic reticulum
golgi bodies
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Cellular respiration (the process of making energy) happens in two main phases:
The Cytoplasm (No Oxygen needed): The first step, called Glycolysis, happens outside the mitochondria in the fluid of the cytoplasm. It breaks down glucose into smaller pieces, but it does not require oxygen to do this.
The Mitochondria (Oxygen needed = Oxidative): Those broken-down pieces of glucose then enter the mitochondria for the final stages (the Krebs Cycle and the Electron Transport Chain). These massive energy-producing steps absolutely require oxygen to work.
Because oxygen is strictly required inside the mitochondria to finish the job and produce all that ATP (power), we call it the oxidative part of the respiratory process.

