A four chambered heart is the muscular organ in vertebrates that pumps blood received from the veins, into the arteries, thus maintaining the flow of blood throughout the entire circulatory system. Bats are one type of animal that do in fact have 4 chambered hearts, since they are mammals.
With that being said, all mammals are equipped with a four chambered heart system that pumps blood into all of the different parts of their body. Their blood brings oxygen to muscles and tissues. In addition, the red blood cells of mammals can carry more oxygen than in many other animals.
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