Question: when we lie our hands down,palm being up,why do our fingers not touch or lie on the ground? 

Answer: our fingers have bones,tendons in them\nbones act as the framework and tendons are like rubber bands that control amount of flexion\nwhen you leave you hands totally free, that is the normal length of the tendons/ligaments and has minimum tension, to make the hand touch the ground, you much stretch your fingers which means increasing tension
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