Immediate

• • When exercise begins, the muscles require extra oxygen and glucose for aerobic exercise
• To ensure fast and efficient delivery of oxygen and glucose to the muscle cells, changes occur in the body:

  • Heart rate increases
  • Contractions of the heart increase and are more powerful —> increases the stroke volume
  • The rate and depth of breathing increases —> ensures that efficient gas exchange in the lungs can still take place
  • Increased body temperature —> e.g - sweating, skin goes red
• Why does sweating occur after immediate exercise?

  Releases heat energy at the skin surface by evaporation of sweat
• Why does the skin turn red after immediate exercise?

  Due to blood vessels at the surface of the skin dialating to realease heat energy by radiation