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Problem : What molecule is at the center of respiration?

Oxygen.

Problem : What are the three main components of the respiratory pathway?

Glycolysis, the citric acid cycle, and oxidative phosphorylation.

Problem : What general role does oxygen play in respiration?

Oxygen helps in respiration by easing the breakdown of food molecules through oxidation.

Problem : Fill in the blanks. Respiration that involves oxygen is called __________ respiration while respiration that does not involve oxygen is called __________ respiration.

Aerobic. Anaerobic.
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