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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
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
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
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
Esophagus | Structure, Function Muscles | 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 - 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
Rectum | Colon, Anal Canal, Sphincters | Britannica Rectum, terminal segment of the digestive system in which feces accumulate just prior to discharge The rectum is continuous with the sigmoid colon and extends 13 to 15 cm (5 to 6 inches) to the anus
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