Like the M 1 and M 3 muscarinic receptor, M 5 receptors are coupled with G proteins of class Gq that upregulate phospholipase C and, therefore, inositol trisphosphate and intracellular calcium as a signaling pathway.
Radioactive iodine is a very effective type of treatment for cancer of the thyroid gland. Thyroid cells absorb iodine. The radioactive iodine from the drink or capsule is absorbed into your body and picked up by the thyroid cancer cells wherever they are. So it can kill the cancer cells even if they have spread.
1 Iodine is usually used in an alcohol solution (called tincture of iodine) or as Lugol's iodine solution as a pre-and postoperative antiseptic. 2  Some people do not recommend disinfecting minor wounds with iodine because of concern that it may induce scar tissue formation and increase healing time.