S5 Small Intestines II

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Station 5 Small intestines II

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S5 Small Intestines II

  1. 1. Mouth EsophagusStomachSmall intestine<br />
  2. 2. Absorption of nutrients in the small intestines<br />6.4 pg 102 What is Absorption?<br />http://www.yenching.edu.hk/biology/absorption.swf<br />
  3. 3. Adaptation of the small intestines for absorption<br />1. Surface Area<br />2. Thin membrane<br />3. Concentration gradient<br /><ul><li>Inner walls have numerous walls
  4. 4. Lined with vili
  5. 5. Microvilli on villi
  6. 6. 1 cell thick epithelium</li></ul>Many capillaries to carry substance away quickly<br />Each villus is a lacteal or lymphatic capillary surrounded by blood capillaries. <br />This continuous transport of digested food substances away from the villus maintains the concentration gradient for absorption. <br />
  7. 7. Increased intestinal surface area<br />1 cell thick epithelium<br />
  8. 8. Q. How is Concentration gradient maintained at the site of the intestinal villus?<br />A concentration gradient is <br /> maintained <br /> at the villus<br /> by the continual transport of digested food substances away from the villus.<br />
  9. 9. How does absorption take place?<br />Legend<br /> Glucose<br /> amino acids<br /> fatty acid &<br /> glycerol<br />fat molecule<br />
  10. 10. Glucose & amino acids diffuses into blood capillaries of villi<br />Glucose & amino acids also enters via active transport<br />Glycerol & fatty acid diffuse into the epithelium, then combines back when they enter lacteal<br />Water & mineral salts also absorbed.<br />How does absorption take place?<br />

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