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🏃 Aerobic and Anaerobic Respiration

Discover how your cells release energy from glucose, with oxygen and without, and why your muscles ache after a sprint.

lessons

~20 min

to learn

🔬 Science

subject

Teens

level

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What you’ll learn

Aerobic RespirationState the word equation for aerobic respiration and explain where and why it happens.Respiration is the reaction that releases energy from glucose inside cells. Aerobic respiration uses oxygen: glucose + oxygen → carbon dioxide + water + energy, taking place in the mitochondria. Breathing and blood deliver the oxygen it needs.
Anaerobic RespirationExplain anaerobic respiration in muscles, the role of lactic acid, and how it compares with aerobic respiration.When oxygen runs short, muscles respire anaerobically, breaking glucose into lactic acid and releasing only a little energy. Lactic acid builds up and causes an oxygen debt, which is why you keep panting afterwards; anaerobic respiration is faster but far less efficient than aerobic.

Questions this course answers

What is respiration?

Respiration is the reaction that releases energy inside cells.

Which of these is the correct word equation for aerobic respiration?

Aerobic respiration uses glucose and oxygen, releasing CO₂, water, and energy.

In which part of the cell does most aerobic respiration happen?

Mitochondria are where aerobic respiration takes place.

What does anaerobic mean?

Anaerobic respiration is respiration without oxygen.

What waste substance does anaerobic respiration produce in your muscles?

Anaerobic respiration in muscles produces lactic acid.

Why do you keep breathing hard after a sprint has finished?

Extra oxygen is needed to break down the lactic acid built up.

Grounded in trusted sources

BBC Bitesize
Britannica
KidsHealth (Nemours)
NHS

Every Wunder lesson is built from real, reputable sources — never invented.

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