Please answer experts,,..,..

Dear student,
Please find below the answer:

The correct option is (1).
When a thyroid-stimulating hormone (TSH) binds to the receptor on the thyroid cells, cells start producing thyroxine and triiodothyronine and release them into the bloodstream. So, stimulation of thyroid gland by TSH causes the release of protein hormone of the thyroid gland. 

Hope this information clears your doubt.

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