Kidneys produce hormones. Normal kidneys also make important chemical messengers called hormones. These hormones circulate in the bloodstream and regulate some body functions such as blood pressure, the making of red blood cells, and the uptake of calcium from the intestine.
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The game is played with wheels called rolle bolles, which are thick but not very large in diameter, and slightly asymmetric like a wheel worn down on one side. Players make up teams generally of 3-4 players. Itâs played outside on a dirt court or sometimes inside.