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A human has around 1.8 m² skin, around 600 muscles and 206 bones, more than 100 joints, 90,000 km veins, arteries and capillaries as well as 13 billion nerve cells. Every minute 4-6 litres of blood are pumped through the heart. A human has some 25 billion red, round blood cells, each with a diameter of 0.007 mm. The total surface amounts to 1,300 m². A brain weighs an average of 1,350. Although the human brain is large, it is not the biggest amongst animals. Both elephants and whales have significantly larger brains.
Answer time 0s (0s). 28% have previously answered correct on this question. The question was created 2008-12-08.
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