57. Which of the following descriptions regarding circulatory system is correct?
(A) The circulatory fluid in closed circulatory system is called hemolymph.
(B) Blood in right ventricle will first deliver to aorta.
(C) Sinoatrial node is located in left atrium.
(D) Erythropoietin is produced from kidney.
(E) Mammals employ positive pressure breathing.
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