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.
Peptic cell or chief cells which forms one of the 3 gastric glands found in mucosa lining of human stomach secretes the protein digesting enzyme pepsinogen. But it is a proenzyme & gets converted to active enzyme pepsin in exposure to HCL secreted by chief cells of same location.