The video explains anaerobic respiration, which occurs without oxygen, leading to lactic acid buildup in muscles and causing cramps. This process creates an oxygen debt, requiring extra oxygen post-exercise to break down lactic acid into carbon dioxide and water. The heart and breathing rates remain high to supply this oxygen. Additionally, lactic acid can be transported to the liver and converted back into glucose. The video concludes with a recap of these concepts.

What is the main product of anaerobic respiration in muscles?

• Carbon dioxide

• Glucose

• Water

• Lactic acid

What is meant by 'oxygen debt'?

• The oxygen used during aerobic respiration

• The oxygen stored in muscles

• The extra oxygen required to break down lactic acid after exercise

• The amount of oxygen needed to start exercise

How does the body repay the oxygen debt?

• By decreasing heart rate

• By increasing heart and breathing rates

• By storing more oxygen in muscles

• By converting lactic acid directly into energy

What happens to lactic acid when it reaches the liver?

• It is used to produce energy

• It is stored as fat

• It is converted back into glucose

• It is converted into carbon dioxide

Which of the following is a way to remove lactic acid from the body?

• Increasing muscle mass

• Converting it into glucose in the liver

• Storing it in the bones

• Using it for aerobic respiration