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Activity of a hormone represents the efficacy of the hormone in causing the intended effect. In case of T3 vs T4, though T4 is the majority fraction, T3 is more active, meaning it is much more efficacious in effecting the results. The concentration of T4 is 30 - 50 times higher than T31. Though T3 is produced by thyroid it is in minority. The majority of ...


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The difference between secretion of ACTH and neurohypophysial hormones is that the prior is a two step process, with CRF from hypothalamus stimulating the anterior pituitary. The latter is produced and secreted from the same cell, only in different organs! Magnocellular neurons stretch from the hypothalamus to the posterior pituitary, where they have their ...


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In my opinion, activeness of a hormone is more about its effect than its production rate. Cortisol and Aldosterone are both adrenal hormones, yet as a mineralocorticid, aldosterone is the active one by great margin (due to intracellular degradation of the glucocorticoids).


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Biological activity has a range of definitions, but in this case I believe it to mean that the T3 hormone is produced at a rate 3-5x that of T4. This can be measured with fluorescent tags. Typically, fluorescent tagging uses a reactive derivative of a fluorescent molecule, called a fluorophore. The fluorophore selectively binds to a specific region or ...


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I found a nice article that has insights to this matter. As posted before me it is true that only adults, but not juvenile individuals show this difference. Direct and indirect effects of sex hormones on bone marrow erythropoiesis and renal erythropoietin production has been proven, but it works in both sexes the same way. Females are capable to elevate ...


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An allergic reaction requiring an epipen can be caused by swelling in the throat and/or bronchoconstriction (spasms decreasing the diameter of bronchioles). Bronchoconstriction can occur in the absence of soft tissue swelling in the lips, tongue and throat, and vs. versa. Epinephrine reduces pharyngeal edema (swelling) because it is a potent vasoconstrictor ...


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I did a quick search and found some research in this area. Sleep inertia is the technical term for feeling groggy for a while after waking up. In a review article by Patricia Tassi, Alain Muzet (Sleep inertia. Sleep Medicine Reviews. Volume 4, Issue 4, August 2000, Pages 341–353), they define sleep inertia as Sleep inertia is a transitional state of ...


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Sleep occurs in stages. There are three stages of non-REM sleep followed by REM sleep. Natural waking occurs during the REM stage. If your alarm goes off while you are in the middle of deep sleep, you are going to feel different from if you had woken up naturally. That's why there's a market for alarm clocks designed to wake you up during light sleep.



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