Cell Organisation 0.0 / 5 ? BiologyCells, tissues and organsEnzymes and digestionExchange of materialsCirculationGCSEAQA Created by: user123Created on: 23-01-18 16:09 Which 3 things can proteins act as? Hormones, antibodies and enzymes 1 of 15 What is the function of an artery? Carry blood away from heart to organs 2 of 15 What is the purpose of lumen in the artery? They maintain pressure 3 of 15 What is the function of veins? Carry blood from organs to heart. (Usually low in oxygen) 4 of 15 What is the lumen in veins like? Large 5 of 15 What is the muscle like in veins? Very thin layer of smooth muscle 6 of 15 What are the walls like in arteries? Thick muscle and elastic fibre walls. 7 of 15 What do valves do? Prevent back flow of blood 8 of 15 What are the outer walls of veins like? Thin with elastic fibres 9 of 15 Which blood vessel has valves? Vein 10 of 15 What is a capillary? Network of tiny vessels that links arteries to veins 11 of 15 What is the function of a capillary? Enables oxygen and glucose to diffuse out of blood and into cells 12 of 15 What is the lumen in a capillary like? narrow 13 of 15 What do the outer walls of a capillary allow? Nutrients and gases to diffuse through 14 of 15 What is the heart made of? Muscle tissue and 4 chambers 15 of 15
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