Cambridge IGCSE Biology (0610) - IGCSE Biology - Heart (9.2)

🎓 IGCSE Biology - The Complete Course: https://www.tes.com/teaching-resource/resource-12989155 IGCSE Chemistry - The Complete Course: 🎓 Complete Teaching Resource (including past exam questions and mark schemes organised by chapter): https://www.tes.com/teaching-resource/resource-13280954 🎓 Student resource (PDF only): https://www.tes.com/teaching-resource/resource-13245244 🎓 All the videos (the complete library on Patreon): https://www.patreon.com/igbiocomplete ☕️ Buy me a coffee - https://www.buymeacoffee.com/ArthurJohnParker Cambridge IGCSE Biology (0610/0970) Chapter 9 - Transport in animals Topic 9.2 - Heart For exams from 2025 (core and extended) As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam! My other channels: @igpecomplete - Cambridge IGCSE PE @ocrpecomplete - OCR GCSE PE Timestamps: 0:00 Contents 0:38 Heart structure 1:41 Monitoring heart activity 2:18 Effect of physical activity 2:41 Coronary heart disease 3:15 CHD risk factors 4:26 Heart valves (extended) 5:04 Muscular walls and septum (extended) 5:29 Effect of physical activity (extended) Core content: - Identify in diagrams and images the structures of the mammalian heart, limited to: muscular wall, septum, left and right ventricles, left and right atria, one-way valves and coronary arteries. - State that blood is pumped away from the heart in arteries and returns to the heart in veins. - State that the activity of the heart may be monitored by: ECG, pulse rate and listening to sounds of valves closing. - Investigate and describe the effect of physical activity on the heart rate. - Describe coronary heart disease in terms of the blockage of coronary arteries. - State the possible risk factors including: diet, lack of exercise, stress, smoking, genetic predisposition, age and sex. - Discuss the roles of diet and exercise in reducing the risk of coronary heart disease. Extended content: - Identify in diagrams and images the atrioventricular and semilunar valves in the mammalian heart. - Explain the relative thickness of the muscle walls of the left and right ventricles and the muscle walls of the atria compared to those of the ventricles. - Explain the importance of the septum in separating oxygenated and deoxygenated blood. - Describe the functioning of the heart in terms of the contraction of muscles of the atria and ventricles and the action of the valves. Context: - In our last lesson we learned about the single circulation system of fish and the double circulation of mammals. - In topic 9.3 we'll move on to look at the structures and functions of the blood vessels (arteries, capillaries and veins), including the width of lumen, thickness of walls, and the presence of pocket valves in the veins. - Finally, in topic 9.4 we'll cover the blood. You'll learn about the four components of blood (plasma, platelets, white blood cells and red blood cells), the process of clotting and the functions of lymphocytes and phagocytes.