digestive system Flashcards
digestive system
converts food to raw materials that build and fuel body’s cells
Alimentary canal/GI tract
continuous muscular digestive tube that winds through the ventral body- open both ends
alimentary canal function
digests, absorbs,
alimentary canal structures/organs
oral cavity, pharynx, esophagus, stomach, small and large intestine, rectum, anus
Accessory digestive structures (function)
Produce secretions that contribute to the breakdown of food
Accessory digestive structures/organs
teeth, tongue, gallbladder, salivary glands, liver and pancreas
ingestion
taking foods/liquids in via the mouth
propulsion
moves food through the alimentary canal
deglution/swallowing
voluntary act of moving food into alimentary canal
buccal phase
compress bolus against hard palate, retracts tongue forcing bolus into oropharynx. (voluntary)
pharyngeal phase
tactile receptors on the uvula are stimulated, medulla oblongata directs muscle contraction in pharyngeal muscles
esophageal phase
a bolus is pushed toward the stomach by peristaltic waves, approach of bolus triggers opening of esophageal sphincter
oral cavity
start of alimentary canal
physical digestion
mastication, chewing
chemical digestion
break down to simpler compounds
salivary gland
secretes saliva to aid in chemical digestion
pharynx
3 parts, nasopharynx, oropharynx, hypopharynx
esophagus
smooth muscle in throat, swallowing is digestion
stomach
amylase (converts starch and glucose), bile (secreted by liver, stored in gallbladder),
pancreatic lipase
usually secreted by the pancreas and transferred to the duodenum to participate in the hydrolysis and digestion of fat, cholesterol esters, and fat-soluble vitamins
pepsin
a stomach enzyme that serves to digest proteins found in ingested food.