The heart is the driving force behind the avian circulatory system, and the vessels of the vascular system are the highways for oxygen, energy, and waste transport. Behind the feathers, a complex and ...
Birds are highly active creatures, capable of explosive speed and incredible stamina. These activities require an advanced respiratory system to oxygenate their blood and an efficient circulatory ...
Circulatory system: Blood vessels Laid end-to-end, an adult's arteries, veins and capillaries would stretch for about 100,000 miles - enough to wrap around the world nearly four times.