Exercise and Respiration
After eating, some of the glucose in the body is stored as glycogen in the liver and muscle cells. Glycogen is then converted back into glucose during exercise when the body needs a lot of energy.
Glucose is stored in the body because a lot of it is used during respiration. The 2 types of respiration are:
- Aerobic respiration, which releases energy using glucose and oxygen, producing the waste product CO2.
- Anaerobic respiration, which releases energy using glucose without oxygen, producing the waste product lactic acid instead of CO2 as glucose isn’t fully broken down.
Aerobic respiration is more efficient than anaerobic respiration because more energy is released and no lactic acid is produced which makes the muscles ache.
During exercise, the body increases its heart rate to pump more oxygen to the muscles for aerobic respiration, and to remove the extra CO2 being produced. Furthermore, the breathing rate increases to increase the amount of oxygen entering the body and CO2 leaving the body.