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anatomy chapter 13

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mastication
process of chewing
digestion
breakdown of food molecules into their individual components
deglutition
the act of swallowing
peristalsis
process of contraction and relaxation of circular smooth muscles which pushes food thru the alimentary canal
gastric juice
acidic secretion of the stomach
lumen
the hole in the center of a tube
macronutrients
nutrients body needs in large amounts-carbs,fats,proteins
micronutrients
nutrients body needs in small amounts-vitamins & minerals
what keeps food from going down into your larynx?
1)the soft palate rises up and closes off nasal cavity
2)larynx rises & epiglottis lowers to seal off larynx
what digestive enzyme is found in saliva?
Amylase which helps breakdown starch into maltose
what is soft palate's function in deglution?
it rises up and closes off the nasal cavity
what are the tunics that are contained in most of the alimentary canal?
serosa, muscularis, submucosa, mucosa. stomach has an extra layer oblique muscularis
what digestive enzyme is secreted by stomach?
pepsin
what does pepsin do?
breaks down proteins into peptides
why doesn't gastric juice in stomach hurt stomach lining?
gastric glands produce mucus which coats stomach lining and protects it from its own gastric juices
what is the role of intrinsic factor?
allows for absorption of vitamin B12 by small intestine
what 3 things are absorbed thru the stomach?
water, alcohol, aspirin
what are the effects of the hormone gastrin?
increases lower esophageal sphincter tone
decreases pyloric sphincter tone
increases rate of secretion from gastric pits
increases rate of mixing waves of stomach
what are the 3 regions of the small intestine?
duodenum, jejunum, ileum
duodenum is the smallest portion
what features in intestine increase the rate at which nutrients are absorbed?
circular folds and intestinal villi covered w/microvilli
what are the 3 main hormones released by small intestine?
secretin, cholecytokinin (CCK), Gastric Inhibitory Peptide (GIP)
what is the effect of secretin?
reduces gastric juice from production & increases secretion of acid-neutralizing juice from pancreas which increases ph of chyme
what is the effect of cholecytokinin (CCK)?
causes gallbladder to contract
what is the effect of gastric inhibitory peptide (GIP)?
decreases rate at which stomach empties
list the major enzymes in the intestinal juice
maltose, sucrase, lactase, peptidase, enterokinase
what does maltase do?
breaks down maltose
what does sucrase do?
breaks down sucrose
what does lactase do?
breaks down lactose
what does peptidase do?
breaks down peptides
what does enterokinase do?
activates trypsinogen into tryposin
why can't a cell produce an active enzyme which breaks down proteins?
cause producing an active protein-digesting enzyme would kill the cell
what functions do the bacteria in the large intestine perform?
produce vitamin K, biotin, folic acid
why do people feel they need to defecate shortly after eating?
the act of filling the stomach triggers mass movements which rapidly move chyme towards rectum
what travels from the portal triads to the central vein in a liver lobule? what flows the opposite way?
blood travels from portal triad to the central vein. bile flows the opposite way
is bile a digestive enzyme? what does it do?
bile is NOT a digestive enzyme. it emulsifies fats, making them easier to digest
which organs produce amylase?
salivary gland and pancreas
what 4 secretions are designed to reduce acidity in alimentary canal?
1. alkaline mucus from duodenenal glands 2. intestinal juice from intestinal glands 3. bile from gallbladder 4. bicarbonate in pancreatic juice
what are the fat soluble vitamins?
vitamins A,D,E,K
what role do most vitamins play in the body?
regulate chemical process in the body
which two vitamins can the body absorb without eating food that contains those vitamins?
vitamin D,K