As long as you know the amplitude tolerance (+/- 3dB), the frequency response range or width tells you how high or low the speaker goes. A speaker rated as 20Hz â 25kHz +/- 3dB will play lower bass and higher treble sounds than a speaker that measures 40Hz â 20kHz +/- 3dB.requency Response In Context. A big improvement would be a frequency response number that also includes the amplitude tolerance, expressed as âXHz-YkHz +/- 3dB.â This tells you that the amplitude of the speakerâs response relative to frequency does not deviate more than 3 Decibels from the center line.
1 Pepsin is the main gastric enzyme. 2  It is produced by the stomach cells called chief cells in its inactive form pepsinogen, which is a zymogen. 3  Pepsinogen is then activated by the stomach acid into its active form, pepsin.here are four types of cells in the stomach: 1  Parietal cells: Produce hydrochloric acid and intrinsic factor. 2  Gastric chief cells: Produce pepsinogen. 3  Chief cells are mainly found in the body of stomach, which is the middle or superior anatomic portion of the stomach.
The other main cell type found in the stomach is the parietal cell. This cell is specialized to release hydrochloric acid, which is the catalyst for the conversion of pepsinogen to pepsin. Both the chief and parietal cells are stimulated by the molecule gastrin, which is made in the blood when peptides are detected in the small intestines.