A nurse is educating a group of nursing students about systemic veins and venules. Based on this information, what is the best response from the nursing student about why the systemic veins and venules are called "blood reservoirs"?
A) The branches of veins grow larger and larger as they near the heart.
B) The total length of blood vessels in the body is about 60,000 miles.
C) The normal amount of blood pumped is 4 to 6 L in 1 minute.
D) They house approximately 60% of the body's blood volume at rest.
D
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Systemic veins and venules are also called "blood reservoirs" because they house approximately 60% of the body's blood volume at rest and have the capacity to store more blood when needed. The branches of the veins grow larger and larger as they near the heart, until finally two large veins return blood to the right atrium. Although the total length of blood vessels in the body is 60,000 miles, capillaries make up most of this length. The amount of blood that the ventricles pump out in 1 minute, between 4 and 6 L, is the cardiac output.
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