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Human digestive system | Description, Parts, Functions | Britannica The human digestive system consists primarily of the digestive tract, or the series of structures and organs through which food and liquids pass during their processing into forms that can be absorbed into the bloodstream
Human digestive system - Anatomy, Organs, Processes | Britannica Human digestive system - Anatomy, Organs, Processes: The small intestine, which is 670 to 760 cm (22 to 25 feet) in length and 3 to 4 cm (about 2 inches) in diameter, is the longest part of the digestive tract
digestive system - Kids | Britannica Kids | Homework Help The digestive tract begins with the mouth and ends at the anus The main organs of the digestive system are the mouth, the pharynx, the esophagus, the stomach, and the small and large intestines
Gastrointestinal tract | Definition, Organs, Diagram, Facts | Britannica The digestive system, composed of the mouth, esophagus, stomach, and intestines, breaks down food into usable substances (nutrients), which are then absorbed from the blood or lymph; this system also eliminates the unusable or excess portion of the food as fecal matter
Human digestive system - Organs, Processes, Functions | Britannica Human digestive system - Organs, Processes, Functions: The liver lies under the lower right rib cage and occupies much of the upper right quadrant of the abdomen, with a portion extending into the upper left quadrant
Human digestive system - Teeth, Enzymes, Digestion | Britannica Human digestive system - Teeth, Enzymes, Digestion: The teeth are hard, white structures found in the mouth Usually used for mastication, the teeth of different vertebrate species are sometimes specialized
Digestive system disease | Definition, Types, Symptoms, Treatments . . . This article discusses the common infections, inflammations, ulcers, and cancers that affect each organ of the digestive tract For a detailed discussion of the anatomy and physiology of the digestive system, see digestive system, human
Human digestive system - Contractions, Motility, Digestion | Britannica Human digestive system - Contractions, Motility, Digestion: The contractions of the circular and longitudinal muscles are regulated by electrical impulses that begin with the passage of calcium ions into the muscle cell
Bile | Digestive System, Gallbladder Liver | Britannica Water-insoluble wastes that the liver removes from blood, such as cholesterol, steroids, drugs, and hemoglobin pigments, are carried in the fluid to the excretory system
Human digestive system - Proteins, Enzymes, Absorption | Britannica Human digestive system - Proteins, Enzymes, Absorption: The digestion of protein entails breaking the complex molecule first into peptides, each having a number of amino acids, and second into individual amino acids