A-Level Biology OCR A
Heart Blood Double Closed Circulatory System Circuit Pumped
| 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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A-Level Biology OCR A