I can see why you might think that since they are such slow moving animals. However, Manatees are mammals and ALL mammals have a four chamber heart which pumps into and out of vessels in a closed system. This allows oxygen and nutrients to be carried effectively through out the body.
Source:http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/Bio%20102/Bio%20102%20lectures/Circulatory%20System/circulat.htm
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