The walls of veins are not thick as those of arteries because
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11%
the blood is in less quantity
42%
the blood is deoxygenated
40%
the blood is low pressured
7%
the blood is thicker
👍2❤1
The number of red blood cells that die every day is
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20%
100 thousand
22%
200 thousands
41%
100 million
17%
200 million
👍6❤1
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