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                              Q:
                           
                           
                                                      | A) Calcitonin | B) Thyroxine | 
| C) Calmodulin | D) all of these | 
                              Answer:   A) Calcitonin
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
Calcitonin is 32-amino acid linear polypeptide hormone that is produced in humans primarily by the parafollicular cells of the thyroid, and in many other animals in the ultimopharyngeal body. It acts to reduce blood calcium, opposing the effects of parathyroid hormone.
 
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