Brief note on digestive system with level of organization
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The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder). Digestion involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body. The process of digestion has many stages. The first stage is the cephalic phaseof digestion which begins with gastric secretions in response to the sight and smell of food. The next stage starts in the mouth.
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