'Target organ' means (radiology) organ intended to receive the therapeutic dose of a radioactive substance
The two main tissues are the kidneys and the bones. Since calcitonin helps decrease calcium blood levels, it inhibits osteoclasts in the bones and stimulates calcium excretion by the kidneys.
The immune system. It regulates T cell development.
Adrenaline targets various organs,mainly - the Heart, Blood vessels, Smooth muscles(of bronchi, uterus, gastrointestinal tract,bladder etc.), the eye (radial muscles of iris), skeletal muscles...
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