GCSE Combined Science (AQA)

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Rate of Blood Flow

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Organisation Animal Tissues, Organs and Organ Systems

Rate of Blood Flow

2:07 Heart Rate and Gaseous Exchange
Spec 4.2.2.2
Previous Lung Anatomy Next Plasma
  • Blood flow is defined as the volume of blood pumped through a blood vessel in a specific period.
  • The heart generates blood flow.
  • Blood flow rate can be calculated by knowing the volume of blood that flows through a vessel in a set period.
  • Common units for blood flow rate include milliliters per minute, liters per minute, milliliters per hour, and liters per hour.
  • Example calculation: 22,400 milliliters of blood flows through the aorta every four minutes.
  • To find the rate per minute, divide 22,400 milliliters by 4, resulting in 5,600 milliliters per minute.
  • To calculate the hourly rate, multiply the per-minute rate (5,600 milliliters) by 60 (minutes in an hour), resulting in 336,000 milliliters per hour or 336 liters per hour.
  • It is crucial to pay attention to units when performing calculations related to blood flow rates.
  • These calculations are essential for exams, and accurate handling of units is emphasized.

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