primary organ flashcards - digestive system | icev

oral cavity

where digestion system starts (in mouth) mastication through saliva breaking down food, starts process of chemical digestion
prevents food from entering naval cavity
breaks down food

pharynx

passageway for food down the throat. nasopharynx, oropharynx, laryngopharynx

esophagus

connects the pharynx to the stomach. is smooth muscle tissue, moves food to stomach by muscle contractions
2 sphincters

stomach

breaks down food through acid in gastric juice, deflates when food is present (ruga)

small intenstine

to absorb nutrients and digestion. longest portion of GI tract. duodenum has secretions. the most villi / circular folds, villi, microvilli (all for absorption)

intestinal glands

located in small intestine and have the Crypt of Lieberkuhn and Brunner’s glands (secrets intestinal and alkaline fluid to protect from acidity

large intestine

last portion of digestion tract. no circular folds or villi, less enzymes secreting cells, has bacteria that digest remaining materials. responsible for finishing absorption, vitamin K and takes feces from body

divided by 4 regions: cecum, colon, rectum, anus