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Ode(1) S.A. node(2)1%. Mammals are said to have a “Double circulatory system”. This means :-(1) That the blood vessels are paired(2) That there are two types of blood vessels attached to every organ: an artery and a vein13That there are two system : one from the heart to the lungs and back to the heart and other to and fromof the body(4) That the blood circulates twice as quickly |
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