Usually during exercise, unlike during rest times the muscle cells need to respire more. So they need more oxygen and glucose for energy and the carbon-dioxide produced as waste must be removed quickly. So when person gets tired or breathes heavily during intensive workouts means they are in need of more oxygen. So the cells starts performing anaerobic(lactic acid ) respiration even though it releases less energy.
<span>6 CO2 + 12 H2O + light energy --> C6H12O6 + 6 O2 + 6 H2O
Energy from the sun begins the splitting of carbon dioxide and water into a sugar molecule, water and oxygen. Sugar is formed from CO2 using ATP and NADPH</span>
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