Hormones



  • Do tropic hormones act directly on the organs? Then why is it written that growth hormone doesn't act directly on organs? Please explain.
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  • @anag I think it should be that growth harmone acts directly on organs(surprisingly is the only harmone from anterior pituitary that acts directly on organs) and calling it tropic must be stopped although we still continue that.
    Tropic harmones acts inderectly on organs. They first act on other endocrine glands cause there secretion of harmones which then act on organs.



  • @anag
    Tropic hormones are hormones that have other endocrine glands as their target. Most tropic hormones are produced and secreted by the anterior pituitary.The hypothalamus secretes tropic hormones that target the anterior pituitary, and the thyroid gland secretes thyroxine, which targets the hypothalamus and therefore can be considered a tropic hormone.
    Tropic hormones are contrasted with non-tropic hormones, which directly stimulate target cells.
    Tropic hormones from the anterior pituitary include:

    Thyroid-stimulating hormone (TSH or thyrotropin) – stimulates the thyroid gland to make and release thyroid hormone.
    Adrenocorticotropic hormone (ACTH or corticotropin) – stimulates the adrenal cortex to release glucocorticoids.
    Luteinizing hormone (LH) – stimulates the release of steroid hormones in gonads—the ovary and testes.
    Follicle-stimulating hormone (FSH) – stimulates the maturation of eggs and production of sperm.

    In turn, the hypothalamus controls the release of hormones from the anterior pituitary by secreting a class of hypothalamic neurohormones called releasing and release-inhibiting hormones—which are released to the hypothalamo-hypophyseal portal system and act on the anterior pituitary.


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