If giraffes had the same anatomy as humans every time they would lean over to get a drink of water the blood rush to the head would cause them to pass out. What anatomical feature prevents giraffes from passing out when they lean over for a drink of water?

Answer One way vein valves to prevent back flow

It is known that giraffes have unique one way valves in their veins to prevent back flow when the head is tilted down.

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