Bearded dragons have some key differences within their circulatory systems that seperate them from humans. Humans have four chambered hearts that completely isolate oxygenated blood from deoxygenated blood. Reptiles, on the other hand, have three chambered hearts where the septum is not fully developed. This causes some mixing of both oxygenated and deoxygenated blood within the heart (Pletsch, 2017). Another key difference is that reptiles possess a second aorta in which semi deoxygenated blood is pumped into the systemic circuit (Farmer & Hicks, 2002). Finally, reptiles are ectothermic which means that they rely on outside sources to maintain their body temperature compared to humans which are endothermic and can maintain a constant body temperature through metabolic processes (Dowling & Zug, 2020).