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The human digestive system is a complex network of organs responsible for breaking down food into nutrients that the body can absorb and use for energy, growth, and repair. The digestive process begins in the mouth, where mechanical digestion occurs through chewing, and chemical digestion begins with the action of salivary enzymes such as amylase, which initiates the breakdown of starch into maltose. Food then moves through the esophagus via peristaltic movements to the stomach. The stomach secretes gastric juices containing hydrochloric acid and pepsin, an enzyme that starts protein digestion by breaking proteins into smaller peptides. The acidic environment of the stomach also helps in killing harmful ________ _______ ____ _______ ________ ________ ______ ____.
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