HUMAN PHYSIOLOGY
DIGESTION AND ABSORPTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Thyrotropin releasing hormone (TRH) is a tripeptide
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Glutathione is a tripeptide
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Oxytocin is nonapeptide
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Vasopressin is nonapeptide
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Surfactant is pentapeptide
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Detailed explanation-1: -Hypothalamic, pituitary and sex hormones Vasopressin is a nonapeptide (t½ 20 min) with two separate G-protein-coupled target receptors responsible for its two roles.
Detailed explanation-2: -Vasopressin (Antidiuretic Hormone) and Water Reabsorption Vasopressin, or antidiuretic hormone (AVP), is a nonapeptide synthesized in specialized neurons of the supraoptic and paraventricular nuclei.
Detailed explanation-3: -An example of a nonapeptide is the bradykinin. Bradykinin is a nonapeptide (RPPGFSPFR) that is formed through the action of proteases on kininogens. It is a potent vasodilator. It increases the permeability of post capillary venules.
Detailed explanation-4: -The mammalian nonapeptide hormones, vasopressin and oxytocin, are known to be potent regulators of social behaviour. Teleost fishes possess vasopressin and oxytocin homologues known as arginine vasotocin (AVT) and isotocin (IT), respectively.