This lesson describes the mechanisms by which the products of digestion are absorbed by the cells lining the ileum. The PowerPoint and accompanying resources are part of the second lesson in a series of 2 which cover the content detailed in point 3.3 of the AQA A-level Biology specification and focuses on the relationship between the structure and function of this section of the small intestine.
This lesson has been specifically planned to challenge the students on their understanding of digestion in the mouth, the stomach and the duodenum as covered in the previous lesson and to build on this knowledge to allow them to recognise how the products of digestion are then absorbed in the ileum. Time is taken to describe how the folds of the ileum known as villi and the multiple microvilli found on each villus act to significantly increase the surface area for absorption and the adsorption of enzymes. The mechanism of co-transport was described in topic 2.3 so a series of exam-style questions are then used to check that the students can explain how these proteins are used to absorb monosaccharides and amino acids from the ileum. The remainder of the lesson explains why the formation of micelles is critical for the absorption of monoglycerides and fatty acids
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Topic 3: Organisms exchange substances with their environment (AQA A-level Biology)
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Topics 3.1, 3.2 & 3.3 (AQA A-level Biology)
This bundle contains 7 lessons which are highly detailed and cover the following points in the surface area to volume ratio, gas exchange and digestion and absorption topics of the AQA A-level Biology specification: * The relationship between the size of an organism or structure and its surface area to volume ratio * The development of systems in larger organisms as adaptations that facilitate exchange as this ratio reduces * Adaptations of gas exchange surfaces in single-celled organisms, insects, bony fish and in the leaf of a dicotyledonous plant * The gross structure of the human gas exchange system * The essential features of the alveolar epithelium over which gas exchange takes place * Ventilation and the exchange of gases in the lungs * Digestion in mammals of carbohydrates, proteins and lipids * Mechanisms for the absorption of the products of digestion by cells lining the ileum If you would like to sample the quality of lessons in this bundle, then download the alveolar epithelium and absorption in the ileum lessons as these have been uploaded for free
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