GCSE Biology - Exercise & Oxygen Debt #22

The video explains how exercise increases the body's need for cellular respiration, requiring more oxygen for muscle activity. It contrasts aerobic and anaerobic respiration, highlighting the inefficiency and lactic acid production of the latter. The concept of oxygen debt is introduced, describing how the body repays it post-exercise by converting lactic acid back to glucose in the liver. Finally, it covers methods to measure the effects of exercise on breathing and heart rate.

Why does our breathing rate increase during exercise?

• To reduce body temperature

• To increase oxygen supply to muscles

• To decrease heart rate

• To conserve energy

What is a major byproduct of anaerobic respiration?

• Carbon dioxide

• Water

• Glucose

• Lactic acid

What is the term used to describe the extra oxygen needed to remove lactic acid after exercise?

• Oxygen debt

• Oxygen deficit

• Oxygen reserve

• Oxygen surplus

How can you measure someone's breathing rate?

• By checking body temperature

• By counting chest rises and falls

• By measuring blood pressure

• By counting heartbeats

Where can you place your fingers to measure your pulse?

• On your forehead

• On an artery in your wrist or neck

• On your ankle

• On your shoulder