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.
Best Answer: Mechanical digestion is where the food is physically broken down into smaller pieces, such as in the mouth. Chemical digestion is where the food is chemically broken down into subatomic particles, starting with the saliva in the mouth and continuing through the small intestine.Source(s):echanical digestion begins in the mouth as the food is chewed.chemical digestion involves breaking down the food into simpler nutrients that can be used by cells. Moriti Â· 5 months ago.