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The main target organs where parathyroid hormone exerts its effects are the bones and the kidneys. When needed, parathyroid hormone is released by the parathyroid glands into the blood and causes the bones to release calcium and increase levels in the bloodstream.
1 The axons of these postganglionic neurons then extend to the target organ.  The cell bodies of parasympathetic preganglionic neurons reside either in the brain stem or in the sacral spinal cord. The axons of these neurons project from these locations along peripheral nerves toward their target organs.