Why thyroxine is a hormone, not an enzyme?

It is secreted in small quantity.

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It is not a polypeptide.

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It has no special effect.

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It is directly poured into the blood.

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Solution

The correct option is D It is directly poured into the blood.
Hormones are produced by the endocrine glands in the body. These glands are also called ductless glands meaning that the glands directly empty the hormones into the bloodstream. The thyroid hormones, triiodothyronine ( $T_{3}$ ) and its prohormone, thyroxine ( $T_{4}$ ) are tyrosine-based hormones produced by the thyroid gland, that are directly released into the blood. Hence, thyroxine is a hormone, not an enzyme.

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