Part 7 - Effects of Exercise

Why does heart rate increase during physical activity? (vimp)

During exercise the muscles require more ATP, so the rate of respiration increases. This means more O₂ and glucose must be delivered by the blood and more CO₂ and waste products must be removed. Therefore, to satisfy this demand the heart rate increases to pump blood faster around the body

What happen if muscles do not receive enough O₂

They begin to respire anaerobically producing lactic acid (a.k.a lactate) and releasing less energy.

What does the build up of lactic acid cause

Muscle fatigue and cramps

So what must be done with the lactic acid

It must be transported to the liver to be broken down

What does this process of anaerobic respiration/lactic build up create

An oxygen dept which needs to be repaid after exercise by continued rapid breathing and an increased heart rate

Give the chemical and word equation for this process

• Glucose → Lactic Acid + Energy

• C₆H₁₂O₆ → 2C₃H₆O₃ + ATP