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>
Im pretty sure it’s 5 years
The heart itself needs blood and nutrients to work properly and gets its share of blood supply from coronary arteries. Coronary heart diseases are linked to coronary arteries. The diseases of coronary arteries are very dangerous; coronary artery diseases like atherosclerosis may cause heart attack.
Answer:
At times, a choice may primarily affect the person who makes it, but never exclusively. Every choice a person makes, large or small, from how time is spent to which career to pursue, will have an effect on another person
Explanation:
Yes, if the person is already sick. But shallow breathing is not good
