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A-Level Biology OCR A

Heart Blood Double Closed Circulatory System Circuit Pumped

A double closed circulatory system involves blood passing through the heart twice per circuit, with two separate circulations: one to the lungs and one to the body. This system maintains high pressure and fast blood flow for efficient substance transport and is present in birds and most mammals.

A double closed circulatory system involves blood passing through the heart twice per circuit, with two separate circulations: one to the lungs and one to the body. This system maintains high pressure and fast blood flow for efficient substance transport and is present in birds and most mammals.

Front Describe the features of a double closed circulatory system and state which animals have them.
Back
Double closed circulatory system:
  • Blood travels through the heart twice per circuit
  • Involves two separate circulations:
    • Blood pumped from heart to lungs to pick up oxygen and unload CO2 and then returns to the heart
    • Blood flows thru the heart and is pumped out to travel around body to deliver oxygen and pick up CO2 before returning to the heart again
  • Each circuit passes thru one capillary network so high pressure and fast blood flow maintained - most efficient system for transporting substances
  • Present in birds and most mammals

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