pptx, 2.32 MB
pptx, 2.32 MB
docx, 14.08 KB
docx, 14.08 KB
docx, 17.22 KB
docx, 17.22 KB

This detailed lesson describes how changes in ventilation rate are brought about to allow for the delivery of oxygen and the removal of carbon dioxide. The engaging PowerPoint and accompanying resources have been designed to cover the second part of point 7.9 (ii) in the Pearson Edexcel A-level Biology A specification.

The previous lesson described the control of heart rate so this lesson has been written to tie in with this and to use this knowledge to further the students understanding of the control of ventilation rate. The lesson begins with a focus on the muscles involved in ventilation, specifically the diaphragm and external intercostal muscles, so that students can understand how their contraction results in an increase in the volume of the thoracic cavity. Boyle’s law is briefly introduced to allow students to recognise the relationship between volume and pressure so that the movement of air with the pressure gradient can be described. Time is then taken to consider the importance of inhalation and an exam-style question challenges the students to explain that a constant supply of oxygen to the alveoli is needed to maintain a steep concentration gradient with the surrounding capillaries. The students are then tasked with writing a description of exhalation at rest using the description of inhalation as their guide. The rest of the lesson focuses on the mechanisms involved in increasing the rate and depth of breathing during exercise. Students will use their knowledge of the control of heart rate to recall that chemoreceptors detect changes in oxygen and carbon dioxide and blood pH and that the medulla oblongata processes the sensory information that it receives before coordinating a response. The final task challenges them to use the information provided in this lesson and the previous one to order 10 detailed descriptions so they can form a complete passage about this control system.

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Topic 7: Run for your life (Pearson Edexcel A-level Biology A)

This bundle contains 17 fully-resourced lessons which have been designed to cover the content as detailed in topic 7 (Run for your life) of the Pearson Edexcel A-Level Biology A (Salters Nuffield) specification. The specification points that are covered within these lessons include: * The interaction of muscles, tendons, ligaments and the skeleton in movement * The contraction of skeletal muscle by the sliding filament theory * The overall reaction of aerobic respiration * The enzymes involved in the multi-stepped process of respiration * The roles of glycolysis in aerobic and anaerobic respiration * The role of the link reaction and the Krebs cycle in the complete oxidation of glucose * Understand how ATP is synthesised by oxidative phosphorylation * The fate of lactate after a period of anaerobic respiration * The myogenic nature of cardiac muscle * The coordination of the heart beat * The use of ECGs to aid diagnosis * Calculating cardiac output * The control of heart rate by the medulla oblongata * The control of ventilation rate * The structure of a muscle fibre * The structural and physiological differences between fast and slow twitch muscle fibres * The meaning of negative and positive feedback control * The principle of negative feedback in maintaining systems within narrow limits * The importance of homeostasis to maintain the body in a state of dynamic equilibrium during exercise * DNA transcription factors, including hormones The lessons have been planned so that they contain 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 topic 7 and earlier topics If you would like to see the quality of the lessons, download the link reaction and Krebs cycle, the fate of lactate,the using ECGs and transcription factors lessons as these have been uploaded for free

£22.00

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