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n

a control mechanism in the body whereby production of a hormone is switched off when levels in the bloodstream become too high.

of or to do with the nervous system.

nerve cells.

a procedure on the brain or nervous system.

a chemical in the body with a job of relaying messages between nerve cells (neurons).

a lump or growth found on a tissue in the body.

a type of investigative procedure using small amounts of radioactive materials, which are attracted to bones or tissues. Special cameras pick up the emitted gamma rays, which are turned into computer images of the body parts being examined.

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