2.64 explain how the heart rate changes during exercise and under the influence of adrenaline

Under exercise

  • When you exercise, your muscles need more energy (they respire more). Therefore in order to get O2 to your muscles and CO2 away quicker, heart race increases.
  • This increases the rate of blood flow, increasing the amount of oxygen and carbon dioxide going in and out of your muscle cells
  • The brain also sends signals to the heart which causes more forceful and frequent contractions

Under adrenalineĀ 

  • Released by the adrenal glands, when an organism is threatened, adrenalin binds to the receptors of the heart and causes the cardiac muscles to pump/contract more frequently (increases the amount of O2 supplied in tissues)

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