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Created with Fabric.js 1.4.5 The Transport System By: Imran and Moa Structure and Function of: Arteries, Capillaries and Veins What is Blood Composed of? What is transpored by blood? Blood transports:Nutrients, Oxygen, Carbon Dioxide, Hormones, Antibodies, Urea, Heat Additionally, Plasma includes:- Salts - Dissolved Gases (O2/CO2)- Nutrients- Wastes- Hormones- Antibodies (proteins) Blood is composed of:- Plasma - Erythrocytes- Leucocytes (phagocytes and lymphocytes)- Platelets Blood Cells:Erythrocytes (RBC's) - transport oxygen- flexible- from stem cells in red marrow of blood- contains oxygen binding protein Hemoglobin Blood Cells:Leucocytes (WBCs)- phagocytes - non-specific defense- lymphocytes - (B & T cells) specific antigen recognition Arteries - To withstand high pressure:>Thick Muscular Wall, Fibrous Coatand Elastic Fiber.- Small Lumen to help maintain high pressure- Valves in aorta and pulmonary arteriesto prevent back flow into ventricles- Arteries contract and dilate to changethe blood pressure and flow Capillaries - No muscular wall or elastic tissue sincepressure is so low- Cell wall is one endothelial cell thick to allow diffusion of gases and tissue fluid- Have some pores and fenestration for rapid diffusion- No valves since pressure is low- Small diameter for easy exchange of materials Veins - Thin walls with more collagen. Fewer elastic fibers relative to arteries since pressure is lower- Very little muscle since no contractions occur- Have valves to prevent backflow- Lumen is always larger in relation to diameter
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