Which of the following is false?Group of answer choicesThe C cells of the thyroid gland produce the hormone calcitonin.Hormones can act as transcription factors within a cell.Thyroid hormone is derived from tyrosine.Hormone release is controlled by a positive feedback mechanism.
Question
Which of the following is false?Group of answer choicesThe C cells of the thyroid gland produce the hormone calcitonin.Hormones can act as transcription factors within a cell.Thyroid hormone is derived from tyrosine.Hormone release is controlled by a positive feedback mechanism.
Solution
The false statement is: "Hormone release is controlled by a positive feedback mechanism."
Most hormone release is controlled by a negative feedback mechanism, not a positive one. In a negative feedback system, the output reduces the original effect of the stimulus. In the context of hormones, when a certain level of a hormone is reached in the bloodstream, the system reduces the production and release of that hormone. This mechanism ensures that hormones stay within their normal ranges.
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