This clear and concise lesson looks at the phenomenon known as the Bohr effect and describes and explains how an increased carbon dioxide concentration effects the dissociation of oxyhaemoglobin. The PowerPoint has been designed to cover the second part of point 3.4.1 of the AQA A-level Biology specification and continually ties in with the previous lesson on the role of haemoglobin.
The lesson begins with a terminology check to ensure that the students can use the terms affinity, oxyhaemoglobin and dissociation. In line with this, they are challenged to draw the oxyhaemoglobin dissociation curve and are reminded that this shows how oxygen associates with haemoglobin but how it dissociates at low partial pressures. Moving forwards, a quick quiz is used to introduce Christian Bohr and the students are given some initial details of his described effect. This leads into a series of discussions where the outcome is the understanding that an increased concentration of carbon dioxide decreases the affinity of haemoglobin for oxygen. The students will learn that this reduction in affinity is a result of a decrease in the pH of the cell cytoplasm which alters the tertiary structure of the haemoglobin. Opportunities are taken at this point to challenge students on their prior knowledge of protein structures as well as the bonds in the tertiary structure. The lesson finishes with a series of questions where the understanding and application skills are tested as students have to explain the benefit of the Bohr effect for an exercising individual.
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Topic 3: Organisms exchange substances with their environment (AQA A-level Biology)
This lesson bundle contains 17 detailed and fully-resourced lessons which cover the following specification points in topic 3 of the AQA A-level Biology specification: Topic 3.1 * 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 Topic 3.2 * Adaptations of gas exchange surfaces as shown by gas exchange in single-celled organisms, insects, bony fish and the leaves of dicotyledonous plants * The gross structure of the human gas exchange system * The essential features of the alveolar epithelium as a surface over which gas exchange takes place * The mechanism of breathing to include the role of the diaphragm and the intercostal muscles Topic 3.3 * During digestion, large molecules are hydrolysed to smaller molecules * Digestion in mammals by amylases, disaccharidases, lipase, endopeptidases, exopeptidases and dipeptidases * Mechanisms for the absorption of the products of digestion by cells lining the ileum of mammals Topic 3.4.1 * The structure and role of haemoglobin in the loading, transport and unloading of oxygen * The effects of carbon dioxide concentration on the dissociation of oxyhaemoglobin * The general pattern of blood circulation in a mammal * The gross structure of the human heart * Pressure and volume changes and valve movements during the cardiac cycle * The structure of the arteries, arterioles and veins * The formation of tissue fluid and its return to the circulatory system Topic 3.4.2 * Xylem as the tissue that transports water * The cohesion-tension theory of water transport * Phloem as the tissue that transports organic substances in plants * The mass flow hypothesis for the mechanism of translocation in plants If you would like to sample the quality of the lessons included in this bundle, then download the following lessons which have been uploaded for free Alveolar epithelium Absorption in the ileum Arteries, arterioles and veins Formation of tissue fluid Translocation
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Mass transport (AQA A-level Biology)
This fully-resourced bundle includes 10 detailed PowerPoint lessons and their accompanying worksheets which cover the content as set out in topic 3.4 (Mass transport) of the AQA A-level Biology specification. This topic includes sections on mass transport in animals (3.4.1) and mass transport in plants (3.4.2). The lessons have been designed to include a wide range of tasks to maintain motivation whilst ensuring that the understanding of the content is constantly checked and links are made to other topics. The specification points in topic 3.4 which are covered in these lessons are: * The haemoglobins * The role of haemoglobin in the transport of oxygen * The oxyhaemoglobin dissociation curve * The Bohr effect * The general pattern of blood circulation in a mammal * The gross structure of the human heart * The valve movements in the cardiac cycle * The structure of the blood vessels * The formation of tissue fluid * The transport of water in the xylem * The structure of the phloem tissue * Translocation by mass flow If you would like to see the quality of these lessons, download the arteries, tissue fluid and translocation lessons as these have been uploaded for free
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Topic 3.4.1: Mass transport in animals (AQA A-level Biology)
Each of the 7 lessons in this bundle are fully-resourced and have been designed to cover the content as detailed in topic 3.4.1 (Mass transport in animals) of the AQA A-Level Biology specification. The specification points that are covered within these lessons include: * Haemoglobin and the role in the transport of oxygen * The effects of carbon dioxide concentration on the dissociation of oxyhaemoglobin * The general pattern of blood circulation in a mammal * The gross structure of the human heart * The calculation of cardiac output * Pressure and volume changes and valve movements during the cardiac cycle * The structure and function of arteries, arterioles and veins * The formation of tissue fluid The lessons have been written to include a wide range of activities and numerous understanding and prior knowledge checks so students can assess their progress against the current topic as well as be challenged to make links to other topics within this topic and earlier topics If you would like to see the quality of the lessons, download the blood vessels and the formation of tissue fluid lessons as these are free
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I've just bought a few bundles from GJHeducation and they have not disappointed. As a very busy teacher, business woman and mummy. These PowerPoints are linked really well to the spec and have saved me hours of time and stress. I love how interactive they are with little quizzes, games and exam questions. Thank you!
New to A-level Biology, these lessons have been an absolute life saver, thank you for sharing your hard work.
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