This detailed lesson describes the transport of sodium and potassium ions in the maintenance of resting potential and how an action potential is formed. The engaging PowerPoint and accompanying resources have been designed to cover the detail included in points 9.5 (i) & (ii) of the Edexcel A-level Biology B specification.
This topic is commonly assessed in the terminal exams so a lot of time has been taken to design this resource to include a wide range of activities that motivate the students whilst ensuring that the content is covered in the depth of detail that will allow them to have a real understanding. Interspersed within the activities are understanding checks and prior knowledge checks to enable the students to not only assess their progress against the current topic but also to challenge themselves on the links to earlier topics such as methods of movements across cell membranes. There are also a number of quiz competitions which are used to introduce key terms and values in a fun and memorable way and discussion points to encourage the students to consider why a particular process or mechanism occurs.
Over the course of the lesson, the students will learn and discover how the movement of ions across the membrane causes the membrane potential to change. They will see how the resting potential is maintained through the use of the sodium/potassium pump and potassium ion leakage. There is a real focus on depolarisation to allow students to understand how generator potentials can combine and if the resulting depolarisation then exceeds the threshold potential, a full depolarisation will occur. At this point in the lesson students will discover how the all or nothing response explains that action potentials have the same magnitude and that instead a stronger stimulus is linked to an increase in the frequency of the transmission. The rest of the lesson challenges the students to apply their knowledge to explain how repolarisation and hyperpolarisation result and to suggest advantages of the refractory period for nerve cells.
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Topic 9: Control systems (Edexcel A-level Biology B)
This bundle contains 15 lessons which are engaging and highly detailed in order to cover the difficult content as set out in topic 9 (Control systems) of the Edexcel A-level Biology B specification. The lesson PowerPoints and accompanying resources contain a wide variety of tasks which cover the following specification points: * Homeostasis is the maintenance of a state of dynamic equilibrium * The importance of maintaining pH, temperature and water potential in the body * The meaning of negative feedback and positive feedback control * The principles of hormone production by endocrine glands * The two main modes of action in hormones * The division of the autonomic nervous system into the sympathetic and parasympathetic systems * The transport of sodium and potassium ions in a resting potential * The formation of an action potential and the propagation along an axon * Saltatory conduction * The function of synapses * The formation and effects of excitatory and inhibitory postsynaptic potentials * The structure of the human retina * The role of rhodopsin * The distribution of rods and cone cells * The control of heart rate by the autonomic nervous system * The gross and microscopic structure of the kidney * The production of urea in the liver and its removal from the blood by ultrafiltration * Selective reabsorption in the proximal tubule * Control of mammalian plasma concentration * The differences between ectotherms and endotherms * The regulation of temperature by endotherms If you would like to sample the quality of this lesson bundle, then download the homeostasis, resting and action potentials and the formation of urea and ultrafiltration lessons as these have been uploaded for free.
£22.00
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Topic 9.5: Nervous transmission (Edexcel A-level Biology B)
This detailed bundle contains 4 lesson PowerPoints and their accompanying resources that cover the following specification points found within topic 9.5 (Nervous transmission) of the Edexcel A-level Biology B specification: * The transport of sodium and potassium ions across the axon membrane results in resting potential * The formation of an action potential and its propagation along an axon * The role of saltatory conduction * The structure and function of a synapse * The formation and effects of excitatory and inhibitory postsynaptic potentials The wide range of tasks, which include exam-style questions with detailed mark schemes, focused discussion points and quiz competitions which introduce key terms and values, will engage and motivate the students whilst the content is covered in the detail required at A-level If you would like to sample the quality of the lessons included in this bundle, then download the resting and action potentials lesson as this has been shared for free
£6.50
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