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Almost all animals have a tube-type digestive system in which food: The waste parts of food that the body can't use are what leave the body as feces.The digestive system is made up of the alimentary canal (also called the digestive tract) and other organs, such as the liver and pancreas.Digestion begins in the mouth, well before food reaches the stomach.
Food is our fuel, and its nutrients give our bodies' cells the energy and substances they need to work.
But before food can do that, it must be digested into small pieces the body can absorb and use.
The large intestine's main job is to remove water from the undigested matter and form solid waste (poop) to be excreted.
The Digestive System The digestive system is a group of organs that perform the process by which food, containing nutrients, is eaten and broken down into different components.
The blood then brings these nutrients to the rest of the body.
The liver (under the ribcage in the right upper part of the abdomen), the gallbladder (hidden just below the liver), and the pancreas (beneath the stomach) are not part of the alimentary canal, but these organs are essential to digestion.The alimentary canal is the long tube of organs — including the esophagus, stomach, and intestines — that runs from the mouth to the anus.An adult's digestive tract is about 30 feet (about 9 meters) long.Swallowing, done by muscle movements in the tongue and mouth, moves the food into the throat, or pharynx (pronounced: FAIR-inks). A soft flap of tissue called the epiglottis (pronounced: ep-ih-GLAH-tus) closes over the windpipe when we swallow to prevent choking.From the throat, food travels down a muscular tube in the chest called the esophagus (pronounced: ih-SAH-fuh-gus).An acidic environment is needed for the digestion that takes place in the stomach.By the time food is ready to leave the stomach, it has been processed into a thick liquid called chyme (pronounced: kime).A walnut-sized muscular valve at the outlet of the stomach called the pylorus (pronounced: pie-LOR-us) keeps chyme in the stomach until it reaches the right consistency to pass into the small intestine.Chyme is then squirted down into the small intestine, where digestion of food continues so the body can absorb the nutrients into the bloodstream.Waves of muscle contractions called peristalsis (pronounced: per-uh-STALL-sus) force food down through the esophagus to the stomach.A person normally isn't aware of the movements of the esophagus, stomach, and intestine that take place as food passes through the digestive tract.