Unit 1.2.2 #2

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  • Unit 1.2.2 #2
    • The Circulatory system
      • Heart, Blood and Blood Vessels.
      • Transports blood around the body to supply O2/nutrients and remove CO2
    • Cardiovascular Fitness
    • Heart Rate
      • The number of times the heart beats per minute.
      • Normal HR is between 60 and 80 BPM. Average is 72 BPM.
      • During exercise, body requires more O2/nutrients so HR increase to supply demand.
      • Can take pulse from Carotid Artery (neck) or Radial Artery (wrist)
      • Heart Recovery Rate
        • The speed at which the heart rate returns to resting after exercise. (Faster = Fitter)
    • Blood Pressure
      • The force exerted by circulating blood on the walls of the arteries.
      • Bottom chambers of heart contract first to pump blood at high pressure into artieries (Systole)
      • Top chambers contract second forcing blood into lower chambers (Diastole)
      • Systolic BP is greatest, Diastolic BP is when it's low (120/80).
      • Affecting factors
        • Higher: Age, Weight, Alcohol, Smoking, >Salt, Stress, Altitude. Lower: Exercise.
    • Stroke Volume
      • The amount of blood pumped by the heart per beat.
    • Cardiac Output
      • The amount of blood pumped by the heart in one minute.
      • HR x SV = CO
      • Controlled by HR and SV


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