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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Best Answer: Those spinning devices are called centrifuges, and they are used to separate the blood into its component parts so that tests can be performed on that component alone. The denser materials (like red blood cells) sink to the bottom, while the lighter ones (like plasma) float to the top.