Key definitions PE

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  • Key Definitions
    • Stroke Volume
      • The amount of blood ejected from the heart per beat.
    • Cardiac Output
      • The amount of blood ejected from the heart per minute. Cardiac output = heart rate x stroke volume.
    • Heart rate
      • The number of times the heart beats per minute.
    • Blood Pressure
      • The strength and force that blood exerts on blood vessels as it is travelling through them.
    • Cholesterol
      • It is made in the liver from fatty foods. There are two types - Low Density Lipoprotein (LDL) and High Density Lipoprotein (HDL).
      • Required in small amount for essential processes in the body.
      • LDL is 'bad' cholesterol. Increases the risk of a heart attack and stroke.
      • HDL is 'good' cholesterol and it transports cholesterol away from the cells back to the liver to be broken down.
    • Ventilation Rate -
      • The rate at which gas enters or leaves the lungs.
    • Lactic Acid
      • A colourless syrupy organic acid formed in sour milk and produced in the muscle tissues during strenuous exercise.
    • Oxygen Debt
      • A temporary oxygen shortage in the body tissues arising from exercise.
    • Gaseous exchange
      • The diffusion of gases from an area of higher concentration to a area of lower concentration.
    • Tidal Volume
      • The volume of air inhaled and exhaled at ach breath.
    • Vital Capacity
      • The amount of air that can be forcibly expelled from the lungs after breathing in as deeply as possible.


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