pptx, 2.12 MB
pptx, 2.12 MB
docx, 350.15 KB
docx, 350.15 KB

This lesson describes how solutes are selectively reabsorbed in the proximal tubule. The PowerPoint and accompanying resource have been designed to cover the first part of specification point 7.20 of the Edexcel International A-level Biology specification and builds on the knowledge gained in the previous lessons on the microscopic structure of the nephron and ultrafiltration.

The lesson begins by challenging the students to recall the substances that are found in the glomerular filtrate so that each of them can be considered over the course of the rest of the lesson. Moving forwards, the first of the numerous discussion points which are included in the lesson is used to get students to predict the component of the filtrate which won’t be found in the urine when they are presented with pie charts from each of these situations. Upon learning that glucose is 100% reabsorbed, along with most of the ions and some of the water, the rest of the lesson focuses on describing the relationship between the structure of the PCT and the function of selective reabsorption. Again, this section begins by encouraging the students to discuss and to predict which structures they would expect to find in a section of the kidney if the function is to reabsorb. They are given the chance to see the structure (as shown in the cover image) before each feature is broken down to explain its importance. Time is taken to look at the role of the cotransporter proteins to explain how this allows glucose, along with sodium ions, to be reabsorbed from the lumen of the PCT into the epithelial cells. The final part of the lesson focuses on urea and how the concentration of this substance increases along the tubule as a result of the reabsorption of some of the water.

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Topic 7: Respiration, Muscles and the Internal Environment (Edexcel Int. A-level Biology)

This bundle contains 20 lesson PowerPoints which are highly detailed to ensure that the topic 7 content is covered at the depth required for A-level Biology. The lessons have been intricately planned to contain a wide variety of tasks that will engage and motivate the students whilst covering the current material and to make links to other lessons in this topic as well as to the previous 6 topics. The tasks, which include exam-style questions with mark schemes, guided discussion time and quick quiz competitions, cover the following points in the respiration, muscles and the internal environment topic of the Edexcel International A-level Biology specification: * The overall reaction of aerobic respiration * The many steps of respiration are controlled and catalysed by a specific intracellular enzyme * 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 * The synthesis of ATP by oxidative phosphorylation * The respiratory quotient * Know the way in which muscles, tendons, the skeleton and ligaments interact in movement * The contraction of skeletal muscle in terms of the sliding filament theory * The myogenic nature of cardiac muscle * The coordination of the heartbeat * The use of ECGs in the diagnosis of abnormal heart rhythms * The calculation of cardiac output * The control of heart rate and ventilation rate by the cardiovascular control centre and the ventilation centre in the medulle oblongata * The role of adrenaline in the fight or flight response * The principle of negative feedback in maintaining systems within narrow limits * The meaning of homeostasis and the maintenance of a dynamic equilibrium in exercise * The gross and microscopic structure of the mammalian kidney * Selective reabsorption in the proximal tubule * Water reabsorption in the loop of Henle * The control of mammalian plasma concentration * Switching genes on and off by DNA transcription factors and the roles of peptide and steroid hormones Due to the detail included in this lesson bundle, it is estimated that it will take in excess of 2 months of allocated A-level teaching time to cover the content If you would like to sample the quality of the lessons in the bundle, then download the skeletal muscle, coordination of the heartbeat, role of adrenaline and control of mammalian plasma concentration lessons as these have been uploaded for free The "negative and positive feedback" and "skeletal muscle" lessons are also uploaded on TES for free but haven't been included in this bundle as the resource limit has been reached

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