Body Fluids and CirculationHard
Question
Mammals are said to have a ′′double circulatory system′′. This means
Options
A.That the blood vessels are paired
B.That there are two types of blood vessels attached to every organ; an artery and a vein
C.That there are two system; one from the heart to the lungs and back to the heart and other to and from rest of the body
D.That the blood circulates twice as quickly
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