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- Human digestive system | Description, Parts, Functions | Britannica
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 | Britannica
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
- 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 The liver, the gall bladder, and the pancreas also help in the process of digestion They produce substances that break food down into simpler forms
- Human digestive system - Rectum, Anus, Digestion | Britannica
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) It ends in a dilated portion called the rectal ampulla, which in front is in contact with the rear surface of the prostate in the male and with the posterior vaginal wall in the female Posteriorly, the rectal ampulla is in front of the tip of the coccyx (the
- 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 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 Its greatest horizontal measurement ranges from 20 to 22 cm (approximately 8 inches); vertically, it extends 15 to 18 cm, and in thickness it ranges from 10 to 13 cm The liver
- 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 The pepsins are enzymes secreted by the stomach in the presence of acid that breaks down proteins (proteolysis) The pepsins account for about 10 to 15 percent of protein digestion They are most active in the first hour of digestion, and their ability to break down protein is
- Human digestive system - Salivary Glands, Enzymes, Digestion | Britannica
Human digestive system - Salivary Glands, Enzymes, Digestion: Food is tasted and mixed with saliva that is secreted by several sets of glands Besides the many minute glands that secrete saliva, there are three major pairs of salivary glands: the parotid, the submandibular, and the sublingual glands The parotid glands, the largest of the pairs, are located at the side of the face, below and in front of each ear The parotid glands are enclosed in sheaths that limit the extent of their
- Human digestive system - Esophagus, Stomach, Intestines | Britannica
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 stomach The esophagus contains four layers—the mucosa, submucosa, muscularis, and tunica adventitia The mucosa is made up of stratified squamous
- Human digestive system - Pharynx, Esophagus, Stomach | Britannica
Human digestive system - Pharynx, Esophagus, Stomach: The pharynx, or throat, is the passageway leading from the mouth and nose to the esophagus and larynx The pharynx permits the passage of swallowed solids and liquids into the esophagus, or gullet, and conducts air to and from the trachea, or windpipe, during respiration The pharynx also connects on either side with the cavity of the middle ear by way of the Eustachian tube and provides for equalization of air pressure on the eardrum
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