Functional sympatholysis Intrinsic and Extrinsic Control of Blood Flow

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🎓 IGCSE Biology - The Complete Course - https://www.tes.com/teaching-resource... • 🎓 IGCSE Chemistry - / igbiocomplete • ☕️ Buy me a coffee - https://www.buymeacoffee.com/ArthurJo... • Cambridge IGCSE Biology (0610/0970) • Chapter 9 - Transport in animals • Topic 9.3 - Blood vessels • For exams in 2023, 2024 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: • ‪@igpecomplete‬Cambridge IGCSE PE • ‪@ocrpecomplete‬OCR GCSE PE • Timestamps: • 0:00 Contents • 0:34 Arteries, veins capillaries • 1:26 Heart, lungs kidneys • 2:10 Blood vessels - structure and function (extended) • 3:17 Liver (extended) • Core content: • Describe the structure of arteries, veins and capillaries, limited to: relative thickness of wall, diameter of the lumen and the presence of valves in veins. • State the functions of capillaries. • Identify in diagrams and images the main blood vessels to and from the: • (a) heart, limited to the vena cava, aorta, pulmonary artery and pulmonary vein. • (b) lungs, limited to the pulmonary artery and pulmonary vein. • (c) kidney, limited to the renal artery and renal vein. • Extended content: • Explain how the structure of arteries and veins is related to the pressure of the blood that they transport. • Explain how the structure of capillaries is related to their functions. • Identify, in diagrams and images, the main blood vessels to and from the liver as: hepatic artery, hepatic veins and hepatic portal vein. • Context: • In topic 9.1 we learned about the single circulation system of fish and the double circulation of mammals. • In topic 9.2 we examined the structures of the heart, including the coronary arteries, atria, ventricles, septum, atrioventricular and semilunar valves, and muscular walls (myocardium). • In topic 9.4 we'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.

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