Water is necessary for digestion: 7 liters of water must circulate each day in the gastrointestinal tract. As we drink on average one and a half liters of water a day and the stools are low (0.1 liters) much is reabsorbed and reused in the digestive bio x4 processesFood or food intake or intake is the first step of the digestive function at large. Liquid food is swallowed, the solid foods are chewed (masticatory Digestion occurs throughout the digestive tract, even though regionalization is observed, each part having a specific role: Digestive enzymes and mucus facilitating chemical digestion are secreted by cells

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