In which groups of animals, closed circulatory system is found? Why blood flows with faster speed and high pressure in these animals?
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In which groups of animals, closed circulatory system is found? Why blood flows with faster speed and high pressure in these animals?
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Closed circulatory system is found in most annelids and
all vertebrates. In these groups, blood flows at faster
speed and high pressure due to force provided by the
rythmic contraction and relaxation of heart muscles.