pptx, 2.32 MB
pptx, 2.32 MB
docx, 14.11 KB
docx, 14.11 KB

This detailed lesson describes how the ventilation rate is controlled by the ventilation centre in the medulla oblongata. The engaging PowerPoint and accompanying resource have been designed to cover the second part of point 7.13 (ii) in unit 5 of the Edexcel International A-level Biology 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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A bundle is a package of resources grouped together to teach a particular topic, or a series of lessons, in one place.

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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

£33.50

Review

5

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melaniepykett

4 years ago
5

this is excellent resources, with great activities. You have saved me so much time and I would definitely recommend

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