[ Ссылка ] to unlock the full GCSE Biology & Combined Science videos series for the new 9-1 OCR, AQA and Edexcel specifications.

They key points covered in this video include:
1. Anaerobic respiration
2. Anaerobic respiration equations

Anaerobic Respiration

Anaerobic respiration is respiration without oxygen. When you put the prefix -an in front of the word, it means without. Aerobic means with oxygen so anaerobic means without oxygen. This can happen when you are exercising very hard and your heart and breathing rate increase. This still may not supply oxygen and glucose fast enough to your muscles. In this case muscles respire anaerobically.

Anaerobic Respiration Equation

Glucose is not broken down completely - it is converted into something called lactic acid. This is the word equation for anaerobic respiration. Because glucose is not fully broken down, not all the energy in glucose is released. This means anaerobic respiration is not as efficient as aerobic respiration - less energy is transferred to the cell. Therefore, anaerobic respiration is not used all the time. It is only used in emergencies such as when you are exercising hard or if a prey is being chased by a predator. Anaerobic respiration also leads to a buildup of lactic acid which is poisonous, this leads to cramps when muscles cells stop contracting. After you finish exercising you still breathe heavily to take in oxygen to break down the lactic acid - this is called an oxygen debt.

Summary

1. Energy is transferred to organisms through respiration
2. Anaerobic respiration does not use oxygen
3. This happens when your muscles aren't supplied with glucose and oxygen fast enough
4. The word equation for anaerobic respiration in animals is
glucose → lactic acid
5. A buildup of lactic acid can cause cramps
6. Anaerobic respiration transfers less energy to the cell than glucose

свернуть