9.6 Absorption Process Intermediate 2 Biology Learning Intentions 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
15 Jan th 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! 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!!! Absorption
The passage of small food molecules through the wall of the alimentary canal and into vessels that can transport them within the body 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 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. 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 Villi
finger-like folds in the surface of the small intestine (Singular villus) 2. Thin Wall Each villus has an extremely thin wall -only one cell thick
-rapid absorption 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!! http://kitses.com/animation/swfs/ digestion.swf This powerpoint was kindly donated to www.worldofteaching.com
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