OCR Biology Respiration Revision Notes

• 1Respiration occurs in two main types: aerobic and anaerobic.
• 2Aerobic respiration requires 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 results in less energy production, along with by-products like lactic acid or ethanol.
• 5Respiration is vital for all living organisms, providing the energy needed for growth, repair, and maintenance.

Respiration is how our cells get energy from food. When we eat, our bodies break down glucose using oxygen, which creates energy, carbon dioxide, and water. If there's no oxygen, our cells can still produce energy, but not as much, and they create different by-products. Overall, respiration is crucial for keeping us alive and functioning.