It's simple it's your mouth. I know it might sound crazy but it's true. Inside your mouth you have teeth you crush and tear of meat, so that's mechanical. Your spit contains enzymes to convert starch into sugars, so that's mechanical.
Most of the digestion occurs (believe it or not) not in the stomach, but the smaller intestine.
Most of the digestion occurs (believe it or not) not in the stomach, but the smaller intestine.
mouth, stomach, samll intestine, large intestine
small intestine
In the walls of the tract organs
Mouth: in saliva there is this amylase enzym to break it down to sugar(s)
The largest organ in the human body, our skin, is effectually, an excellent mechanical barrier. There are of course, some chemical and bacterial (normal flora) factors that play a part, but its mechanical function is its largest asset for sure. A break in the integrity of this mechanical barrier (i.e. an abrasion, laceration, puncture, incision, etc) provides an open door and an excellent opportunity for foreign bacteria and viruses to invade and potentially infect the host.
Stomach and Mouth
chemical cellular tissue organ organ system
Teethyour mouth
Mechanical, of course.. If you experience your saliva deteriorating your food any time soon, let me know. Actually, saliva is there to help break down carbohydrates. The teeth in the mouth also digest food mechanically. In other words, the mouth uses both chemical and mechanical digestion to break down food.
The liver is the organ that uses bile to break down food. The liver is a very important organ to digestion.