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2012-02-10 00:43:21

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    • author "me"
    • tags ""
    • description ""
    • fileName "Digestion"
    • freezingBlueDBID -1.0
    • What is large intestine for
    • To remove water
  1. Why is digestion of large food molecules essential
    Because monomers are whats used
  2. Why are enzymes used in digestion
    To catalyze reactions at lower temperatures
  3. What are the main parts of the alimentary canal
    Mouth, tongue, oral cavity, phayrnx, esophagus, stomach, small intestine, large intestine, rectum, and anus
  4. What are the digestive glands
    Salivary glands, pancreas, and liver
  5. What is peristalsis
    Rythmic waves of contraction of smooth muscles in the walls of the digestive tract and move food through the alimentary canal
  6. What does the pyrloric sphincter does
    Regulates the passage of food out of the stomach and into the small intestine
  7. What does saliva contain
    • Glycoprotien proctects soft lining and lubricates
    • Buffers to neutralize food and prevent tooth decay
    • Antibacterial agents
    • Salivary amylase
  8. What types of digestion begin the the oral cavity
    Mechanical and chemical
  9. What four kinds of teeth do you have
    Incisors, canines, premolars, molars
  10. What does salivary amylase initiate in chemical digestion
  11. What does the tongue do
    • Taste
    • Manipulates food and helps shape it into a ball called a bolus
  12. What is the trachea
    The windpipe
  13. What prevents food from going down the wrong pipe
    The epiglottis tips down over the opening to the trachea during swallowing
  14. What is the larynx
    Voice box
  15. What is the epiglottis
    Flap of cartilage and fibrous connective tissue over the trachea opening
  16. What happens after the bolus enters the esophagus
    The larynx moves down epiglottis up
  17. What does the esophageal spinctor do
    Controls the esophageal opening
  18. What is the esophagus
    Muscular tube the conveys food boluses from pharynx to the stomach
  19. What is the pharynx
    Pathway from mouth to windpipe and esophagus
  20. What does the stomach do
    Stores food and breaks it down with acid and enzymes
  21. What is gastric juice made up of
    Mucus, enzymes and strong acids
  22. What is the function of gastric juice
    Break apart cells in food and kill most bacteria and other microbes
  23. What do the interior stomach walls look like
    Highly folded with pits leading down to the tubular gastric glands
  24. What three types of cells do the gastric glands have
    • Mucus cells
    • Parietal cells
    • Chief cells
  25. What do the three types of gastric gland cells secriete
    The different conponents of the gastric juice
  26. What do the mucous cells do
    Secrete mucous which lubricates and proctects the cells lining the stomach
  27. What do the parietal cells do
    Secrete hydrocloric acid
  28. What do the chief cells do
    Secrete pepsinogen, an inactive form of the enzyme pepsin
  29. How does pepsinogen , hci, and pepsin interact in the stomach
    • 1. Pepsinogen and hci are secreted into the lumen (cavity) of the stomach
    • 2. The hci converts pepsinogen to pepsin
    • 3. Pepsin the activates more pepsinogen starting a chain reaction
  30. What does pepsin begin
    The chemical digestion of protiens its splits the polypeptides chains into smaller polypeptides
  31. What prevents gastric juice from digesting away the stomach lining