The second statement best explains the type of blood vessel and the function of these vessels' valves - <span>These are veins, which prevent the backflow of blood because the walls have little muscle to pump blood back to the heart.
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Veins are large blood vessels which carry blood back to the heart. <span>Veins have a system of valves to prevent back-flow.</span>
Depression
what disorder is she suffering from?
Give the person your full attention.
DNA, or deoxy riboneucleic acid, is made of proteins.
Catalase is a common enzyme that is found in all living organisms and is responsible for the decomposition of hydrogen peroxide into hydrogen and water.
<span>To check and diagnose the deficiency of catalase, a test is performed by adding hydrogen peroxide to blood and if it will turn black-brown without foaming there is a deficiency of catalase.</span>
