6.1 Digestion + Absorption

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6.1 Digestion + Absorption



Topic 6: Human physiology                                                                                                                                                                                                 20  Hours




Digestion and absorption




6.1 Concept mapping

6.1 Knowledge control

6.1 Presentation

6.1 Video/Animations

6.1 Past Paper Questions


Essential idea:


6.1.1  The structure of the wall of the small intestine allows it to move, digest and absorb food.


Digestion animation

Digestive system virtual body

101 Interactive Anatomy Models

Digestive interactive

Great resources of digestion

Digestion interactive animation

Digestion lesson

Animation of organs of digestion

Interactive anatomy

Interactive animation

Interactive study of digestive system organs

Great links about digestion


Nature of science:


6.1.2  Use models as representations of the real world—dialysis tubing can be used to model absorption in the intestine. (1.10)




6.1.3   The contraction of circular and longitudinal muscle of the small intestine

mixes the food with enzymes and moves it along the gut.


Peristalsis 1

Peristalsis 2

Three phases of gastric secretion



6.1.4   The pancreas secretes enzymes into the lumen of the small intestine.


The liver and pancreas video

Liver Structure and the Flow of Blood and Bile



6.1.5   Enzymes digest most macromolecules in food into monomers in the small



 Interactive enzyme lesson


Animation how enzymes work?



6.1.6   Villi increase the surface area of epithelium over which absorption is carried out.


6.1.7   Villi absorb monomers formed by digestion as well as mineral ions and



Fat digestion and bile animation

Interactive animation of digestive system


6.1.8   Different methods of membrane transport are required to absorb different nutrients.


Interactive animation of fatty acid metabolism




6.1.9   Application: Processes occurring in the small intestine that result in the

digestion of starch and transport of the products of digestion to the liver.


6.1.10  Application: Use of dialysis tubing to model absorption of digested food in the intestine.



İTunes/Apps/Build a body


 Grade 12 Biology: The Digestive System/İTunes/Apps


Digestive systems worksheets 1


Digestive systems worksheets 2


Interactive Frog Dissection





6.1.11  Skill: Production of an annotated diagram of the digestive system.


6.1.12  Skill: Identification of tissue layers in transverse sections of the small intestine viewed with a microscope or in a micrograph.





6.1.13   Students should know that amylase, lipase and an endopeptidase are

secreted by the pancreas. The name trypsin and the method used to activate

it are not required.


6.1.14   Students should know that starch, glycogen, lipids and nucleic acids are

digested into monomers and that cellulose remains undigested.


6.1.15   Tissue layers should include longitudinal and circular muscles, mucosa and epithelium.




6.1.16  Some hydrolytic enzymes have economic importance, for example amylase in production of sugars from starch and in the brewing of beer.


6.1.17  Syllabus and cross-curricular links:



Topic 2.1 Molecules to metabolism

Topic 2.5 Enzymes


Digestive System Problems


Disorders od digestive system

Interesting body facts






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