Asked in PPSC, FPSC and other one-paper exams (compiled from unofficial resources).
Body Systems (Human Biology)Respiratory System
Main energy source in respiration:
- A.GlucoseCorrect answer
- B.Oxygen
- C.Carbon dioxide
- D.Water
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Practice these MCQs in the appQuick fact: The main energy source in respiration is glucose, which is broken down to release ATP for cellular activities.