📚 IGCSE OCR Biology: Respiration Exam Essentials | IGCSE OCR 生物：呼吸作用 考点精讲
Respiration is a fundamental biological process that releases energy from organic molecules such as glucose, allowing cells to carry out vital functions. For IGCSE OCR Biology, it is essential to distinguish between aerobic and anaerobic respiration, recall the word and chemical equations, understand the role of ATP, and describe practical investigations.
呼吸作用是释放有机分子（如葡萄糖）中能量的基本生物学过程，使细胞能够执行生命功能。在IGCSE OCR生物学考试中，必须区分有氧呼吸与无氧呼吸，记住文字和化学方程式，理解ATP的作用，并能描述实验探究。
1. What is Respiration? | 什么是呼吸作用？
Respiration is the process by which cells break down glucose to release energy in the form of ATP (adenosine triphosphate). It is not the same as breathing (ventilation) – respiration is a chemical reaction inside cells, while breathing is the physical movement of air in and out of the lungs.
呼吸作用是细胞分解葡萄糖以释放ATP（三磷酸腺苷）形式能量的过程。它不同于呼吸（通气）——呼吸作用是细胞内的化学反应，而呼吸是空气进出肺部的物理运动。
2. Aerobic Respiration | 有氧呼吸
Aerobic respiration requires oxygen and yields a large amount of energy. It takes place in the mitochondria of cells. The overall process completely oxidises glucose into carbon dioxide and water.
有氧呼吸需要氧气，并产生大量能量。它发生在细胞的线粒体中。整个过程将葡萄糖完全氧化为二氧化碳和水。
The word equation is:
文字方程式为：
Glucose + Oxygen → Carbon dioxide + Water + Energy (ATP)
The balanced chemical equation is:
平衡化学方程式为：
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy (ATP)
3. Anaerobic Respiration in Animals | 动物中的无氧呼吸
When oxygen is insufficient, animal cells can respire anaerobically. This process breaks down glucose incompletely, producing lactic acid and releasing only a small amount of energy.
当氧气不足时，动物细胞可以进行无氧呼吸。该过程不完全分解葡萄糖，产生乳酸，仅释放少量能量。
Word equation: Glucose → Lactic acid + Energy (small amount)
文字方程式：葡萄糖 → 乳酸 + 能量（少量）
C₆H₁₂O₆ → 2C₃H₆O₃ + Energy (ATP)
4. Anaerobic Respiration in Yeast and Plants (Fermentation) | 酵母与植物的无氧呼吸（发酵）
Yeast and some plant cells carry out a different form of anaerobic respiration known as ethanol fermentation. Glucose is broken down into ethanol and carbon dioxide, releasing a small amount of energy.
酵母和某些植物细胞进行另一种形式的无氧呼吸，称为乙醇发酵。葡萄糖被分解为乙醇和二氧化碳，释放少量能量。
Word equation: Glucose → Ethanol + Carbon dioxide + Energy (small amount)
文字方程式：葡萄糖 → 乙醇 + 二氧化碳 + 能量（少量）
C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ + Energy (ATP)
5. Word and Chemical Equations Summary | 文字与化学方程式总结
It is crucial to memorise the equations for examinations. Below is a quick reference.
务必牢记这些方程式以应对考试。以下是快速参考。
Aerobic: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
有氧：C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
Anaerobic (animals): C₆H₁₂O₆ → 2C₃H₆O₃
无氧（动物）：C₆H₁₂O₆ → 2C₃H₆O₃
Anaerobic (yeast): C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂
无氧（酵母）：C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂
6. Comparing Aerobic and Anaerobic Respiration | 有氧呼吸与无氧呼吸的比较
The following table summarises the key differences between aerobic and anaerobic respiration.
下表总结了有氧呼吸与无氧呼吸之间的主要区别。
| Feature 特征 |
Aerobic 有氧呼吸 |
Anaerobic (Animals) 无氧（动物） |
Anaerobic (Yeast) 无氧（酵母） |
| Oxygen required? 需要氧气？ |
Yes 是 |
No 否 |
No 否 |
| Energy yield 能量产量 |
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