Which is a uniquely sympathetic function?
a. regulation of body temperature
b. regulation of pupil size
c. regulation of respiratory rate
d. regulation of cardiac rate

The correct answer will be option-A

Explanation:

Homeostasis refers to maintaining the internal temperature of the body irrespective of the external condition. However, the signals from the outer environment directly influence the mechanism which maintains the homeostatic state.

The homeostatic mechanisms maintain the body temperature and pH of the blood.

The sympathetic nervous system regulates the body temperature by producing hormones and activation of the parasympathetic nervous system. All other responses of the sympathetic nervous system are not unique.

Thus, option-A is the correct answer.

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                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion