The Science Behind the Body's Response to Exercise

The video explains how exercise increases the body's energy demand, requiring more glucose and oxygen for cellular respiration. It describes physiological responses like increased breathing and heart rates to supply muscles with oxygenated blood. When oxygen is insufficient, anaerobic respiration occurs, producing lactic acid and causing muscle cramps. The video also discusses oxygen debt and muscle fatigue resulting from intense exercise.

What physiological changes occur in the body to meet the increased energy demand during exercise?

• Increased production of lactic acid

• Decreased glucose and oxygen supply to muscles

• Increased heart rate, breathing rate, and breath volume

• Decreased heart rate and shallow breathing

What happens when there is not enough oxygen available for aerobic respiration during exercise?

• Breathing rate decreases

• Muscles receive more oxygenated blood

• Anaerobic respiration occurs, producing lactic acid

• The body stops producing energy

What is the main byproduct of anaerobic respiration in muscles?

• Water

• Carbon dioxide

• Lactic acid

• Glucose

What is an oxygen debt?

• The oxygen stored in muscles during rest

• The extra oxygen required to remove lactic acid after exercise

• The oxygen used during aerobic respiration

• The amount of oxygen needed to convert glucose into energy

Which of the following is a consequence of prolonged intense exercise?

• Decreased production of lactic acid

• Muscle fatigue and inefficient contraction

• Increased oxygen supply to muscles

• Increased efficiency of muscle contraction