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Absorption of Food PowerPoint Presentation

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Absorption of Food Presentation Transcript

Slide 1 - 9.6 – Absorption Process Intermediate 2 Biology
Slide 2 - Learning Intentions 15th Jan Everyone should complete: 1-Absorption Model 2-Visking Tube Experiment 3-Small Intestine Most people will complete: The Check Test for 9.6 The Home Practice for 9.6 Some people might start: Problem solving Torrance Intermediate 2 Biology textbook p 240 ‘Applying Your Knowledge’
Slide 3 - 1 - Absorption The alimentary canal (or gut) is a long tube inside the body Any food in the alimentary canal is still outside the cells of the body To get inside the molecules of the food have to be able to pass through the wall of the alimentary canal Now try the ‘Model Absorption’ kit!
Slide 4 - Think….. What does the piece of tube in the model represent? Why can the food molecules inside the tube still be regarded as ‘outside’ the body? Which food molecules in the model were able to pass through the wall of the tube most easily? Why was this? Why were the protein molecules in the model unable to pass through the wall of the tube? Now complete the ‘Notes’!!!
Slide 5 - Absorption ‘The passage of small food molecules through the wall of the alimentary canal and into vessels that can transport them within the body’
Slide 6 - 2 - Visking Tubing Experiment a diagram of the experiment when set up what the visking tubing was being used to represent how you tested for starch and glucose and a table of your results an explanation of the results in terms of size of the food molecules involved
Slide 7 - 3 – Small Intestine Small, soluble food molecules are absorbed through the wall of the small intestine To absorb food molecules efficiently the small intestine has three main adaptations…….
Slide 8 - 1. A Large Surface Area The small intestine is very long -6m long The inner surface on the intestine is folded -covered with many finger-like projections called villi -greatly increase the surface area in contact with digested food
Slide 9 - ppt slide no 9 content not found
Slide 10 - Villi ‘finger-like folds in the surface of the small intestine’ (Singular – villus)
Slide 11 - 2. Thin Wall Each villus has an extremely thin wall -only one cell thick -rapid absorption
Slide 12 - 3. Good Blood Supply Each villus is supplied with blood vessels to receive the absorbed foods -glucose/amino acids/vitamins/minerals are absorbed into blood capillaries -products of fat digestion absorbed into lacteal Now complete the ‘Notes’!!
Slide 13 - http://kitses.com/animation/swfs/digestion.swf
Slide 14 - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.
 

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