A T4 assay is used to
A) determine the number of calories in food.
B) directly measure the basal metabolic rate.
C) obtain an index of metabolic activity.
D) monitor the energy efficiency of metabolism.
E) determine the amount of oxygen consumed during metabolism.

Question

Quizplus · Accepted Answer

A T4 assay is a blood test that measures the level of thyroxine (T4), a hormone produced by the thyroid gland. T4 is involved in regulating the body's metabolism, so a T4 assay can provide an index of metabolic activity. It does not directly measure basal metabolic rate or oxygen consumption, nor does it give information about energy efficiency.

A T4 Assay Is Used to