Ephedrine can be easily pass with the cell membrane more than the epinephrine. Option (A) is Correct.
In reaction to stress, the adrenal medulla releases the hormone epinephrine, which is mediated via sympathetic fibers. Because the gland sits atop the kidney, the word "epinephrine" derives from the Greek words "epi," which means "above," and "nephros," which means kidney. Due to the name of its gland, epinephrine is also known as adrenaline.
For this reason, epinephrine and norepinephrine receptors are often referred to as adrenergic receptors. Based on how the adrenergic receptors responded to epinephrine, norepinephrine, and the adrenergic agonist isoproterenol, Ahlquist classified the adrenergic receptors as either or in 1948. Compared to the receptors, the receptors react to significantly lower amounts of epinephrine or norepinephrine. While epinephrine and norepinephrine affect 1 receptors in roughly similar amounts, 2 receptors are more responsive to epinephrine. Phenoxybenzamine and propanolol both inhibit the receptors.
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