9：Nine.6 – Absorption Process - World of Teaching.ppt

– Absorption ProcessIntermediate 2 BiologyLearning Intentions 15th JanEveryone plete:?1-Absorption Model?2-Visking Tube Experiment?3-Small IntestineMost people plete:?The Check Test for ?The Home Practice for people might start:?Problem solvingTorrance Intermediate 2 Biology textbook p 240 ‘Applying Your Knowledge’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 canalNow 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?plete 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 involved3 – 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 foodVilli‘finger-like folds in the surface of the small intestine’(Singular –villus)