Transport in Animals-Blood Vessels AS 0.0 / 5 ? BiologyHuman, animal and plant physiologyASOCR Created by: LegendofZeldaCreated on: 06-04-18 13:21 Arteries Structure Thick walls to withstand high pressure coming from the heart Strong elastin fibre walls to withstand the force of blood and to stretch to take larger blood volume Small lumen to maintain pressure for an efficient rate of blood flow Function Carry blood away from the heart Carries oxygenated blood (except pulmonary artery) Carried under high pressure to reach all cells and meet demands 1 of 3 Veins Function Carry deoxygenated blood (except pulmonary vein) Carry blood back to the vessels connected to the heart Structure Large lumen Strong collagen outer walls Valves to prevent backflow of blood Bigger veins run between muscles so when muscles contract blood is forced towards the heart 2 of 3 Capillaries Structure The outer wall is one cell thick for efficient diffusion of substances Small lumen Very thin walls Function Links arteries to veins Diffusion of substances in and out of the blood 3 of 3
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