Absolute maximum is 115.7 years of age
        
             
        
        
        
Target Tissues or organs  <span />
        
             
        
        
        
The <span>cytoplasm that surrounds the nucleus of a neuron is called the </span><span>perikaryon</span>
        
             
        
        
        
Answer: A. Thyroid Gland
Explanation: The thyroid gland regulates the body's metabolism, while parathyroid glands regulate calcium levels and have no effect on metabolism. Parathyroid hormone (PTH) has a very powerful influence on the cells of your bones by causing them to release their calcium into the bloodstream.