When food enters from esophagus, one of the functions of the stomach is to produce and release enzymes. These enzymes help in the digestive mechanism. The pH here is two (2) that provides the optimum acidity environment for the maximum activity of pepsin, a protein-digesting enzyme.
The clavichord is a European stringed keyboard instrument known from the late Medieval, through the Renaissance, Baroque and Classical eras. Historically, it was mostly used as a practice instrument and as an aid to composition, not being loud enough for larger performances. The clavichord produces sound by striking brass or iron strings with small metal blades called tangents. Vibrations are transmitted through the bridge(s) to the soundboard.
[edit] History and use. The clavichord was invented in the early fourteenth century. It was popular in the 16th-18th centuries, but mainly flourished in German-speaking lands, Scandinavia and the Iberian Peninsula in the latter period; it fell out of use in the 1840s.In the late 1890s, Arnold Dolmetsch revived clavichord construction.hey maintain a level of interest amongst buyers, and are manufactured worldwide. A modern clavichord can range in price from $2,400 to as much as $20,000. There are now numerous clavichord societies around the world, and some 400 recordings of the instrument have been made in the past 70 years.