Year 11 Biology Digestion 2

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Author:
treleneluecke
ID:
142185
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Year 11 Biology Digestion 2
Updated:
2012-03-22 22:00:40
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Digestion
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Group 2
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  1. Describe chemical digestion and its importance.
    Chemical digestion is the chemical change of complex molecules into simpler ones, so that the simpler molecules can pass through plasma membranes into cells.
  2. What does the absorption of food involve?
    The absorption of food involves the organic molecules passing through membranes of cells lining the digestive tract and then into body fluids.
  3. What happens in the stomach?
    The stomach is a large pouch where food is stored, the glands secrete enzymes and hydrochloric acid, and the digestion of protein begins. It is also contains bacteria to digest cellulose.
  4. What is gastric juice?
    Gastric juice is a mixture of mucus, enzymes and hydrocholic acid.The components of gastric juice are secreted by different kinds if cells in the stomach wall.
  5. What separates the stomach and the small intestine? How does it work? Why is it important?
    Pyloric Sphincter separates the stomach from the small intestine by a force of small amounts of food out of the stomach through a muscular opening
  6. What is the name of the first part of the small intestine?
  7. What happens in the duedenum?
    The duodenum is about 25cm long and is the first part of the small intestine. It contains enzymes and substances that help in the breakdown of food.
  8. What is the function of the pancreas in digestion?
    The funstion of the pancreas in digestion is to secrete substances into the duodenum via the pancreatic duct. This nsubstances include bicarbonates, amylases, protein digesting enzymes, lipases and nucleases which all help in the breakdown of food.
  9. What is the function of the liver in digestion?
    The function of the liver in digestion is to produce bile which is used to break up large fat droplets into smaller droplets through a process called emulsification.
  10. What is bile? What does it do? Where is it stored?
    Bile is a greenish fluid which contains, Bile salts and Cholesterol.
  11. Name the 3 parts of the small intestine:
    The three main parts of the Small intestines are the duodenum, jejunum and ileum
  12. Describe the major function of the small intestine:

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