pptx, 1.78 MB
pptx, 1.78 MB
docx, 15.99 KB
docx, 15.99 KB
docx, 14 KB
docx, 14 KB

This lesson explains how negative feedback control maintains systems within narrow limits and uses biological examples to describe the meaning of positive feedback. The PowerPoint and accompanying resources have been designed to cover points 7.11 (i) and (ii) of the Pearson Edexcel A-level Biology A (Salters Nuffield) specification but have been planned to provide important details for upcoming topics such as the importance of homeostasis during exercise and the depolarisation of a neurone.

The normal ranges for blood glucose concentration, blood pH and body temperature are introduced at the start of the lesson to allow students to recognise that these aspects have to be maintained within narrow limits. A series of exam-style questions then challenge their recall of knowledge from topics 1 - 6 as well as earlier in topic 7 to explain why it’s important that each of these aspects is maintained within these limits. The students were introduced to homeostasis at GCSE, so this process is revisited and discussed, so that students are prepared for an upcoming lesson on exercise, as well as for the next part of the lesson on negative feedback control. Students will learn how this form of control reverses the original change and biological examples are used to emphasise the importance of this system for restoring levels to the limits (and the optimum). The remainder of the lesson explains how positive feedback differs from negative feedback as it increases the original change and the role of oxytocin in birth and the movement of sodium ions into a neurone are used to exemplify the action of this control system.

Get this resource as part of a bundle and save up to 33%

A bundle is a package of resources grouped together to teach a particular topic, or a series of lessons, in one place.

Bundle

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

Reviews

Something went wrong, please try again later.

This resource hasn't been reviewed yet

To ensure quality for our reviews, only customers who have purchased this resource can review it

Report this resourceto let us know if it violates our terms and conditions.
Our customer service team will review your report and will be in touch.