Conversely, inhibition of CCK B receptors in the gut produces similar inhibition of secretion of gastric acid and pepsinogen enzymes as is seen with inhibition of CCK A receptors, suggesting that while the CCK A and CCK B receptors comprise two structurally distinct families which bind different ligands and are primarily expressed in different tissues, they produce similar effects, and the distinction between their gastrointestinal and anxiolytic actions depends mainly on where they are expressed in the body.
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:( 1 ) Above pH 5 or so, human pepsin is reversibly inactivated, but above ~ pH 6 or 7, it's irreversible . ( Though some other pepsins, e . g . chicken pepsin, is quite stable at neutral pH . ) ( 1a ) IIRC, the irreversible change is due to one terminal's ( N or C, I don't remember ) the N-terminal's instability; at neutral pH, it tends to move away from the active site, thereby accelerating denaturation ( see ) . ( 3 ) Human pepsin is secreted by chief cells as pepsinogen, which is inactive because part of the protein is blocking its catalytic site.
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