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Questions and Answers
What is the primary energy source released during respiration?
What is the primary energy source released during respiration?
- Electrical energy
- Mechanical energy
- Thermal energy
- Chemical energy (correct)
What is the byproduct of food oxidation during respiration?
What is the byproduct of food oxidation during respiration?
- CO2 (correct)
- H2O
- O2
- C6H12O6
What is the role of enzymes in respiration?
What is the role of enzymes in respiration?
- To oxidize respirable substances
- To catalyze the oxidation-reduction process (correct)
- To release energy from food
- To reduce O2 to H2O
What is the ratio of absorbed O2 to liberated CO2 during respiration?
What is the ratio of absorbed O2 to liberated CO2 during respiration?
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What happens when living cells respire in a closed system?
What happens when living cells respire in a closed system?
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What percentage of air is occupied by atmospheric O2 in a closed system?
What percentage of air is occupied by atmospheric O2 in a closed system?
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Study Notes
Respiration Overview
- Respiration is an energy-releasing process from food, involving oxidation-reduction of respirable substances like carbohydrates, proteins, and fats.
- The process produces CO₂ and absorbs O₂, releasing chemical energy stored in the substances.
Respiration Reaction
- C₆H₁₂O₆ (glucose) + O₂ → Energy + CO₂ + H₂O
Oxygen Absorption and CO₂ Liberation
- Living cells respire continuously, absorbing O₂ and liberating CO₂ in a 1:1 ratio.
- Absorbed O₂ is reduced to H₂O by accepting electrons (e⁻).
Respiratory Process in a Closed System
- In a closed system, if living cells respire in the presence of atmospheric O₂, a vacuum will be created as O₂ is exhausted to produce CO₂.
- The vacuum will not exceed 20% of the volume, as atmospheric O₂ occupies 20% of the air in the closed system.
Objectives
- Study the respiration process in living cells.
- Evaluate the absorption of O₂ and liberation of CO₂ during respiration.
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