Which of the conditions would be most likely to cause a decrease in core temperature?
a. increased thyroxine secretion
b. decreased t4 secretion
c. increase epinephrine secretion
d. peripheral vasoconstriction

B. decreased T4 secretion

Explanation:

T4 (thyroxine) is amino acid derived hormone, synthesized and secreted by thyroid gland. The main function of T4 hormone is to regulate body metabolism.

Thyroid hormones are also responsible for temperature regulation as increased T4 secretion increases temperature of body by increasing metabolism. Under hypothyroidism (decreased secretion of T4) leads to decrease in body temperature.

Thus, the correct answer is option (B).

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