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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 three stages. The first stage is the cephalic phase of digestion which begins with gastric secretions in response to the sight and smell of food. This stage includes the mechanical breakdown of food by chewing, and the chemical breakdown by digestive enzymes, that takes place in the mouth.
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Explanation:
- Enzymes in the saliva begin to digest starches and fats.
- With the help of the tongue, the resulting bolus is moved into the esophagus by swallowing.
- The extensive chemical process of digestion begins in the mouth.
- As food is chewed, saliva, produced by the salivary glands, mixes with the food.
- Digestion works by moving food through the GI tract.
- Digestion begins in the mouth with chewing and ends in the small intestine.
- The body then absorbs these smaller molecules through the walls of the small intestine into the bloodstream, which delivers them to the rest of the body.
- Through a four-stage process (ingestion, digestion, absorption, and elimination), your body takes what it needs from the foods you consume.
- After food enters the body through ingestion, the next stage of food processing,digestion, begins.
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