Describe how a single circulatory system is different to a double circulatory system. The human circulatory system is a double circulatory system.
Some animals such as fish have a single circulatory system.
In both systems, blood is transported in arteries and veins

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Explanation:

A double circulation system has the lungs on a separate ‘loop’ from the rest of the body. That allows the pulmonary (lung) circulation to operate at low-pressures suited to the delicate tissues of the lungs while the systemic (main) circulation operates at high-pressures in the rest of the body.

You couldn’t have an amphibian giraffe. With a single circulation system, if the blood pressure was high enough to pump blood up to the head, then the lungs would have to be so strongly built that they couldn’t do effective gas-exchange. If the blood pressure was low enough to allow the lungs to work – then the animal would keep fainting due to blood not reaching the brain.

Also, a double system keeps oxygenated and de-oxygenated blood separate, meaning that energy isn’t wasted pumping O 2 -poor and CO 2 -rich blood back around the body.

So the double system is just better engineering. It allows for oxygen and nutrients to be delivered more efficiently, it removes toxins more effectively and it redistribute heat better.

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