What is the oxygen debt?
- Money owed for gym fees
- Extra oxygen used after exercise to clear lactate and restock
- Holding your breath during a sprint
Which releases more energy per glucose molecule?
- Anaerobic respiration
- Aerobic respiration
- Both release exactly the same
Yeast fermentation makes lactate, just like hard-working muscle.
Circle one: True False
Why does a sprinter breathe hard for minutes after finishing?
- To cool the tongue
- To repay the oxygen debt and clear lactate
- To practise breathing
Bread dough rises. Which process and gas are behind it?
- Yeast fermentation making carbon dioxide
- Muscle respiration making oxygen
- Photosynthesis making sugar
Which pair are the inputs of aerobic respiration?
- Carbon dioxide and water
- Glucose and oxygen
- Lactate and ethanol
A coach claims the debt is repaid by standing still and holding your breath. What is wrong?
- Lactate clears itself instantly
- Debts never get repaid
- Repayment needs extra oxygen, so deep panting does the work
Two runners sprint equally hard, but the fitter one makes less lactate. Why?
- Fitter runners breathe less
- Fitter muscles need no energy
- Fitter bodies deliver oxygen faster, delaying the switch
Why sprinters keep panting W1-mt_mvnCjThdTH-s1
- Extra oxygen used after exercise to clear lactate and restock · Hard minutes borrow energy that easy minutes repay with oxygen.
- Aerobic respiration · Oxygen pays hugely: about thirty ATP against two.
- False · Yeast makes ethanol and carbon dioxide, while muscle makes lactate.
- To repay the oxygen debt and clear lactate · Panting supplies the extra oxygen that clears lactate and restocks stores.
- Yeast fermentation making carbon dioxide · Yeast turns sugar into ethanol and carbon dioxide, which lifts the dough.
- Glucose and oxygen · Glucose plus oxygen burn fully into carbon dioxide, water and ATP.
- Repayment needs extra oxygen, so deep panting does the work · Holding breath starves the repayment that extra oxygen performs.
- Fitter bodies deliver oxygen faster, delaying the switch · Better delivery holds the aerobic path open longer.