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DigestiveSysAnatomy
| Term | Definition |
|---|---|
| *digestive system is responsible for | -breaking down nutrients and delivering them to cells -breaking down food eaten -releasing foods nutrients into the body -absorbing nutrients into the body |
| *Digestive system consists of | -oral cavity -pharynx -esophagus -stomach -small intestine -large intestine -accessory organs --including the salivary glands, liver, gallbladder and pancreas |
| *digestive system functions | -ingestion -mastication (chewing) -propulsion -mixing -secretion -digestion -absorption -defecation |
| digestive system organs tissue layers | *varying arrangements -mucosa -submucosa -muscularis -serosa/adventitia |
| *mucosa | innermost layer with direct contact to food |
| submucosa | -contains blood vessels, lymphatic vessels and glands |
| *muscularis | -smooth muscle to support movement through the digestive tract |
| serosa/adventitia | -outer most layer |
| *ingestion | entry of food into the body |
| *mastication (chewing) | process in which food is inserted into the mouth and chewed with the teeth |
| *propulsion | movement of food through the digestive tract |
| *mixing | movement of food back and forth within the digestive tract to mix with digestive secretions |
| *secretion | works to lubricate, liquify, buffer and digest food as it moves through the digestive tract |
| *digestion | proccess of breaking down nutrients into forms which can be easily used by cells within the body |
| *absorption | movement of nutrients out of the digestive system and into the bloodstream to be delivered to cells |
| *defecation | elimination of waste products from the body |
| *accessory organs | -liver -gallbladder -pancreas |
| *liver is separated | -is separated into a right and left lobe |
| *liver produces | -bile |
| *liver helps emulsify | -lipids before they can be absorbed into the body |
| *sugar is stored in | -the form of glycogen |
| liver stores | -nutrients filtered from the bloodstream |
| *liver converts | -ingested nutrients into forms which can be utilized by tissues in the body |
| *liver can synthesize | -certain amino acids, plasma proteins and many factors essential for blood coagulation |
| liver filters | -harmful substances and converts them into forms which are safe to excrete by the body -*detoxes the body |
| *liver has the ability to | -undergo phagocytosis |
| gallbladder location | -under livers right lobe |
| *gallbladder | -concentrates and stores bile produced in the liver |
| pancreas location | -sites behind the stomach and connects to the duodenum |
| *pancreas has both | -exocrine and endocrine functions |
| *endocrine | -releasing hormones into the blood |
| *exocrine | -secreting digestive enzymes |
| *pancreas produces | -pancreatic juice to aid in digestion |
| *pancreatic juice is | -mixture of water, salts, sodium bicarbonate and digestive enzymes released into the small intestine |
| *digestive system primary organs include | -oral cavity -pharynx -esophagus -stomach -small intestine -large intestine |
| *oral cavity starts | -the process of chemical digestion |
| *oral cavity includes | -lips and cheeks -palate -tongue -salivary glands -teeth |
| *lips and cheeks | hold food in mouth |
| *palate | -prevents food from entering the nasal cavity |
| *tounge | -moves food around in mouth |
| *salivary glands | -secretes saliva |
| *teeth | -breaks down food |
| *pharynx consists of 3 parts | -nasopharynx -oropharynx -laryngopharynx |
| *esophagus | -is a tube connecting the pharynx to the stomach |
| *esophagus contains two | -sphincters to prevent food from flowing the wrong direction |
| *stomach is a | -muscular organ which breaks down food |
| *stomach breaks down food through | -secretion of acid and enzymes in gastric juice -hydrochloric acid |
| *small intestine is | -largest portion of the GI tract |
| small intestine has 3 regions | -duodenum -jejunum -ileum |
| *duodenum | -bile and pancreatic secretions are introduced |
| ileum | -contains the most villi |
| *circular folds | -deep ridges in the mucosa to slow the movement for maximum absorption |
| *villi | -small projections to increase surface area allowing for greater absorption |
| *microvilli | -smaller villi with enzymes to support digestion and absorption of carbohydrates and proteins |
| intestinal glands include | -brunners glands |
| *brunners glands | secrete an alkaline fluid to protect from acidic contents |
| *large intestine | -is the last portion of the digestive tract and frames the small intestine |
| *large intestine has no | -circular fold or villi |
| *large intestine contains few | -enzyme secreting cells |
| *large intestine contains | -bacteria which digest remaining materials and can synthesize certain vitamins |
| *4 regions of large intestine | -cecum -colon -rectum -anus |
| *rectum | -separates gas and feces |