Thyroid-Stimulating Hormone (TSH). Guide. A thyroid-stimulating hormone (TSH) blood test is used to check for thyroid gland problems. TSH is produced when the hypothalamus releases a substance called thyrotropin-releasing hormone (TRH). TRH then triggers the pituitary gland to release TSH.
A Raven is black but depending on which way the light hits it they change to other colors like bluish, dark red, or greenish. There are white Ravens but are not albino.
What does the raven symbolize in The Raven poem? The Raven could signify two things, one dark and one light. In darkness it could signify is the dark and depressing memory of the loss of Lenore, constantly reminding the wr â¦ iter that he shall never see his love again.