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(po-TASS-ee-um)
![](https://webarchive.library.unt.edu/eot2008/20081026012734im_/http://www.nci.nih.gov/images/spacer.gif)
| A metallic element that is important in body functions such as regulation of blood pressure and of water content in cells, transmission of nerve impulses, digestion, muscle contraction, and heartbeat. |
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