Mouth. It all begins with mastication, the mechanical chewing and grinding of food by the teeth. Mastication increases the surface area of the food so the impact of the various digestive processes throughout the bowel transit are magnified.
Mdomoni. Yote huanza na kutafuna, kutafuna mitambo na kusaga chakula na meno. Kutafuna kuongezeka kwa uso eneo la chakula hivyo athari za hatua mbalimbali digestive katika matumbo transit ni kujitukuza.