OCR Biology Respiration Revision Notes

• 1Respiration occurs in two main types: aerobic and anaerobic.
• 2Aerobic respiration uses oxygen and produces more energy than anaerobic respiration.
• 3The main stages of aerobic respiration are glycolysis, the Krebs cycle, and the electron transport chain.
• 4Anaerobic respiration occurs in the absence of oxygen and produces less energy, resulting in by-products like lactic acid or ethanol.
• 5Respiration is crucial for maintaining metabolic processes and supporting life.

Respiration is how living things get energy from food. It involves breaking down glucose using oxygen to produce energy, water, and carbon dioxide. If there isn't enough oxygen, some organisms can still get energy but produce less and create different waste products. This process is vital for all life forms to function properly.