Tim is overweight. his physician has decided to test him to see if there is a problem with the regulation of his metabolism. which endocrine gland will be the focus of diagnostic testing? a. adrenal b. thymus c. thyroid d. pancreas e. pituitary

C. Thyroid

Explanation:

The thyroid gland is an endocrine gland in the human body and serves to secrete thyroxine (T4), triiodothyronine (T3) and calcitonin hormones. T3 and T4 are iodinated amino acid derivatives and target the body cells to increase the metabolic rate.  

Thyroxine (T4), triiodothyronine (T3) from the thyroid gland stimulate all body cells to increase the rate of breakdown of glucose by cellular respiration and to release more and more energy to perform various functions.  

When these two hormones are not secreted in an adequate amount, the metabolic rate of the body is reduced which in turn leads to weight gain. Therefore, the thyroid gland and its secretions are checked in an overweight person to confirm the cause of the weight gain.  

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