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.
Mechanical digestion is done by chewing and griding of food in mouth by the help of teeths and by parastaltic movemetn of stomach.    Chemical digestion is done by brea â¦ k down of complex food into simpler one by the help of some enzymes and digestive juices.he digestion process begins in the mouth. Chewing your food is a mechanical form of digestion. The saliva in your mouth begins to chemically break down your food, which is ch â¦ emical digestion.      Food is chewed,mixed,and churned    both mechanical and chemical digestion happen in your body.