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This detailed slideshow covers the whole of the EdExcel 9-1 Biology topic 2, including: cells, tissues, organs and systems, plant and animal cells and what they contain, specialised cells, cell differentiation, stem cells, stem cell research, carbohydrates, fats and proteins, testing foods for starch, sugar, protein and fat, enzymes and what conditions they work best in, diffusion, diffusion in the lungs, single celled organisms, osmosis, active transport, root hair cells, examples of active transport in plants and humans, active transport compared to diffusion and osmosis, photosynthesis and what it needs, the equation for photosynthesis, limiting factors, how to encourage photosynthesis, leaf structure, stomata and what they do, how plants use minerals, the starch test, the healthy eating wheel, food types, factors that affect how much energy we need, the digestive system and how it works, peristalsis, enzymes in digestion, bile and the liver, diffusion in villi, calorimetry, respiration and its equations, anearobic respiration in plants and yeast, diffusion in plants, gas concentrations in a plant over a day, the effect of light on gas exchange, the respiratory system, how breathing works, how alveoli work, damaging the lungs, heart disease, coronary heart disease and its link to smoking, surface area to volume ratios, xylem and phloem, transpiration, factors affecting transpiration, measuring the rate of transpiration, the four parts of blood, white blood cells, producing antibodies and antitoxins, specific antibodies, memory cells, vaccinations, blood clotting, the structure of the heart, health and what affects it, arteries, veins and capillaries, the circulatory system, double circulation and how it works, excretion in plants, excreting waste products in humans, the urinary system, kidneys and how ultrafiltration and selective reabsorption work, the structure of the kidney, controlling water content in humans and the role of ADH, the nervous and endocrine systems, homestasis, plant hormones, the central nervous system, nervous and reflex actions, synapses, the eye and its structure, how we focus on different distances, how the body regulates temperature, the endocrine system, hormones in the menstrual cycle (including the role of FSH and LH).

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