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