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.
Even though the mechanical and chemical digestion processes are very important for the human digestive process, chemical digestion is considered more important. This is due to the complex procedure involved in Chemical digestion. Summary: 1. Mechanical digestion refers to the digestion process that breaks the food into smaller particles. 2. Chemical digestion is the process where acids, bases and enzymes released into the digestive track responds to semi-solid food lumps. 3.