Human digestive system | Description, Parts, & Functions | Britannica
2024年9月14日 · The human digestive system is the series of structures and organs through which food and liquids pass during their processing into forms that can be absorbed into the bloodstream.
Gastrointestinal tract | Definition, Organs, Diagram, & Facts
2024年9月15日 · Gastrointestinal tract, pathway by which food enters the body and solid wastes are expelled. The gastrointestinal tract includes the mouth, pharynx, esophagus, stomach, small intestine, large intestine, and anus.
Human digestive system - Anatomy, Organs, Processes | Britannica
2024年9月14日 · 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. It begins at the pylorus, the juncture with the stomach, and ends at the ileocecal valve, the juncture with the colon.
Human digestive system - Gastrointestinal Tract, Immunity, …
2024年9月14日 · Human digestive system - Gastrointestinal Tract, Immunity, Digestion: The body is continuously exposed to damage by viruses, bacteria, and parasites; ingested toxins and chemicals, including drugs and food additives; and foreign protein of plant origin.
Human digestive system - Organs, Processes, Functions | Britannica
2024年9月14日 · 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. The organ weighs from 1.2 to 1.6 kg (2.6 to 3.5 pounds) and is somewhat larger in men than in women.
Human digestive system - Intestinal Gas, Digestive Process, …
2024年9月14日 · Human digestive system - Intestinal Gas, Digestive Process, Nutrition: The movement of gas through the intestines produces the gurgling sounds known as borborygmi. In the resting state there are usually about 200 ml of gas in the gastrointestinal tract. Its composition varies: between 20 and 90 percent is nitrogen, up to 10 percent is oxygen ...
Human digestive system - Esophagus, Stomach, Intestines
2024年9月14日 · Human digestive system - Esophagus, Stomach, Intestines: The esophagus, which passes food from the pharynx to the stomach, is about 25 cm (10 inches) in length; the width varies from 1.5 to 2 cm (about 1 inch). The esophagus lies behind the trachea and heart and in front of the spinal column; it passes through the diaphragm before entering the ...
Human digestive system - Bile, Enzymes, Absorption | Britannica
2024年9月14日 · Human digestive system - Bile, Enzymes, Absorption: The primary digestive function of bile is to aid in the dispersion and digestion of fat in the lumen of the small intestine. Bile is formed initially in the hepatocyte (liver cell), and the rate of formation is dependent primarily on the rate at which bile acids are secreted into the bile ...
digestive system disease - Encyclopedia Britannica
Digestive system disease, any of the diseases that affect the human digestive tract. Such disorders may affect the esophagus, stomach, small intestine, large intestine (colon), pancreas, liver, or biliary tract.
Human digestive system - Rectum, Anus, Digestion | Britannica
2024年9月14日 · Human digestive system - Rectum, Anus, Digestion: The rectum, which is a continuation of the sigmoid colon, begins in front of the midsacrum (the sacrum is the triangular bone near the base of the spine and between the two hipbones).
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