Drug Name Differin

A prerequisite for rapid renal elimination is a hepatic conjugation reaction (p. 38), mainly with glycine (> salicyluric acid) and glucuronic acid. At high dosage, the conjugation may become rate limiting. Elimination now increasingly depends on unchanged salicylate, which is excreted only slowly. Group-specific adverse effects can be attributed to inhibition of cyclooxygenase (B).
The narrow therapeutic margin can be explained by the mechanism of action. Cardiac glycosides (CG) bind to the extracellular side of Na+/K+-ATPases of cardiomyocytes and inhibit enzyme activity. The Na+/K+-ATPases operate to pump out Na+ leaked into the cell and to retrieve K+ leaked from the cell.

 

The endogenous male gonadal hormone is the steroid testosterone from the interstitial Leydig cells of the testis. Testosterone secretion is stimulated by hypophyseal luteinizing hormone (LH), whose release is controlled by hypothalamic GnRH (gonadorelin). Release of both hormones is subject to feedback inhibition by circulating testosterone.
Because most skeletal muscle fibers are innervated only by a single endplate, activation of such fibers, with lengths up to 30 cm, entails propagation of the AP through the entire cell. If the AP fails, the muscle fiber remains in a relaxed state. The effect of a standard dose of succinylcholine lasts only about 10 min.