This is a ringing that sets in after excessive noise exposure, such as in a rock concert (being too near the speakers) or the explosion of a firecracker. This excessive noise can cause injury to the ear, causing the ringing. The tinnitus will usually clear up on its own, and will last anywhere from minutes to hours.
Mechanical digestion is the actual physical break down of food into smaller pieces. One example of this is mastication (chewing) which occurs in the mouth by the teeth, which act to cut and grind food into smaller pieces. This makes them easier to later digest as it increases the SA of the food molecules.
copyright. all right reserved It doesn't the only kind of digestion is Chemical Digestion which is caused by your Stomach Acid. :) Mechanical digestion does occur in the stomach along with chemical digestion. The stomach squeezes the chyme and that is considered to be mechanical digestion. Once in the stomach, more chemical and mechanical digestion occurs. The crushing and breaking action of the stomachs contractions with HCl help not only break down food, but also lend a hand in converting pepsinogen to the enzyme pepsin.