This bundle of 18 lessons covers all of the content in Topic C3 (Chemical reactions) of the OCR Gateway A GCSE Combined Science specification. The topics covered within these lessons include: Conservation of mass Writing word and symbol equations Writing ionic equations The mole Mole calculations Calculating masses Concentrations Endothermic and exothermic reactions Bond energy calculations Making salts Reactions of acids Oxidation and reduction reactions Electrolysis Writing half equations for electrolysis Detecting gases All of these lesson presentations and accompanying resources are detailed and engaging and contain regular progress checks to allow the students to constantly assess their understanding.

This bundle contains 17 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 Water reabsorption in the loop of Henle 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.

This bundle contains 19 fully-resourced and detailed lessons that have been designed to cover the content of topic 6 of the AQA A-level Biology specification which concerns the responses of organisms to stimuli. The wide range of activities included in each lesson will engage the students whilst the detailed content is covered and the understanding and prior knowledge checks allow them to assess their progress on the current topic as well as challenging them to make links to other related topics. Most of the tasks are differentiated to allow differing abilities to access the work and be challenged. The following sub-topics are covered in this bundle of lessons: Survival and response in flowering plants The role of sensory receptors as outlined by the Pacinian corpuscle The human retina as a sensory receptor The differences in rods and cones that enable different sensitivity to light, colour and visual acuity The roles of the SAN, AVN, Bundle of His and Purkyne fibres in the conduction system of the heart The control of heart rate The structure of a myelinated motor neurone The factors that affect the speed of conduction of an impulse The generation and transmission of nerve impulses The transmission at a cholinergic synapse and a neuromuscular junction Summation The contraction of skeletal muscles The structure and properties of slow and fast skeletal muscle fibres The principles of homeostasis including negative feedback systems The control of blood glucose concentration by the controlled release of insulin and glucagon The causes and control of diabetes type I and II The gross structure of the kidney The detailed structure of the nephron The production of glomerular filtrate The reabsorption of glucose and water in the PCT Maintaining a gradient of sodium ions in the medulla by the loop of Henle The role of the hypothalamus, posterior pituitary and ADH in osmoregulation This is one of the 8 topics which have to be covered over the length of the 2 year course and therefore it is expected that the teaching time for this bundle will be in excess of 2 months If you want to see the quality of the lessons before purchasing then the lessons on responses in flowering plants, saltatory conduction, the contraction of skeletal muscles and ultrafiltration are free resources to download