Exercise

Exercise increases the heart rate

• Muscle cells use oxygen to release energy from glucose, which is then used to contract the muscles
• More muscle activity requires more glucose and oxygen to be supplied. Extra carbon dioxide needs to be removes. This means that blood needs to flow at a faster rate

Physical activity

• increases your breathing rate
• makes you breate deeper to meet demands for extra oxygen
• increases the speed at which the heart pumps

Glycogen is used during exercise

• Some glucose from food is stored as glycogen
• Stored in the liver
• Glycogen is converted back to glucose during heavier exercise to provide more energy