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what is the hormone of pineal gland?


  1. Melatonin, 5-methoxy-N-acetyltryptamine, is a hormone found in all living creatures from algae to humans, at levels that vary in a diurnal cycle. In higher animals melatonin is produced by pinealocytes in the pineal gland (located in the brain) and also by the retina and GI tract. It is naturally synthesized from the amino acid tryptophan (derived from serotonin) by the enzyme 5-hydroxyindole-O-methyltransferase.
    Many biological effects of melatonin are produced through activation of melatonin receptors, others are due to its role as a pervasive and extremely powerful antioxidant with a particular role in the protection of nuclear and mitochondrial DNA. Melatonin is also synthesized by various plants, such as rice, and ingested melatonin has been shown to be capable of reaching and binding to melatonin binding sites in the brains of mammals
    Production of melatonin by the pineal gland is under the influence of the suprachiasmatic nucleus of the hypothalamus (SCN) which receives information from the retina about the daily pattern of light and darkness. This signal forms part of the system that regulates the circadian cycle, but it is the SCN that controls the daily cycle in most components of the paracrine and endocrine systems rather than the melatonin signal (as was once postulated). Melatonin produced in the pineal gland acts as an endocrine hormone since it is released into the blood.

  2. The pineal gland was the last endocrine gland to have its function discovered. Its location deep in the brain seemed to indicate its importance. This combination led to its being a “mystery” gland with myth, superstition and even metaphysical theories surrounding its perceived function.
    The pineal gland is occasionally associated with the sixth chakra (also called Ajna or the third eye chakra in yoga). It is believed by some to be a dormant organ that can be awakened to enable “telepathic” communication.
    In the physical body the eye views objects upside down. It sends the image of what it observes to the brain which interprets the image and makes it appear right side-up to us.
    But the human body has another physical eye whose function has long been recognized by humanity. It is called the ‘Third Eye’ which in reality is the Pineal Gland. It is long thought to have mystical powers. Many consider it the Spiritual Third Eye, our Inner Vision.

  3. Melotonin is the only hormone secreted by the pineal gland. (The pineal gland is a tiny endocrine gland situated at the centre of the brain.) Melatonin was discovered in 1958 by Aaron B. Lerner and other researchers working at Yale University. Melatonin is produced in humans, other mammals, birds, reptiles, and amphibians. It is present in very small amounts in the human body.


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