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How does blood transport oxygen, metabolites, and hormones?A.
Blood mediates the metabolic interactions among all tissues.
B.
It transports nutrients from the small intestine to the liver and from the liver and adipose tissue to other organs; it also transports waste products from extrahepatic tissues to the liver for processing and to the kidneys for excretion.
C.
Oxygen moves in the bloodstream from the lungs to the tissues, and CO 2 generated by tissue respiration returns via the bloodstream to the lungs for exhalation.
D.
Blood also carries hormonal signals from one tissue to another. In its role as signal carrier, the circulatory system resembles the nervous system: both regulate and integrate the activities of different organs.
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