Biology B3 2.2 Keeping the blood flowing. 0.0 / 5 ? BiologyCirculationGCSEAQA Created by: Atlanta and JacobCreated on: 16-03-16 18:32 What are the main types of blood vessel? Arteries, veins and capillaries. 1 of 15 What happens to substances in the capillaries? Substances diffuse between the blood and the cells in the capillaries. 2 of 15 How can blocked or narrowed arteries be widened? Stents can be inserted to keep blood vessels open or widen blood vessels. 3 of 15 What can be done if heart valves become damaged? Damaged heart valves can be replaced. Artificial or animal valves can be inserted in the heart to replace damaged valves. 4 of 15 What do arteries do? Carry blood away from the heart . 5 of 15 What is the structure of arteries? They have thick walls containing muscle and elastic tissue. 6 of 15 How are veins different to arteries? They have thinner walls than arteries and often have valves along their length to prevent back flow of blood. 7 of 15 What is the structure of capillaries? They are narrow, thin-walled vessels. 8 of 15 What do capillaries do? They carry the blood through the organs and allow the exchange of substances with all the living cells in the body. 9 of 15 What keeps the blood flowing through the blood vessels? The heart. 10 of 15 What happens if blood vessels are blocked or too narrow? The blood will not flow efficiently. 11 of 15 What happens when blood cannot flow efficiently? The organs will be deprived of nutrients and oxygen. 12 of 15 When are stents particularly beneficial? When coronary arteries become narrowed due to fatty deposits, cutting off the blood supply to the heart muscle. 13 of 15 What is the implication of a leaky valve? Leaky valves mean the blood could flow in the wrong direction. 14 of 15 **MAKE SURE YOU CAN EXPLAIN WHY A NARROWED BLOOD VESSEL OR LEAKY VALVE CAUSES PROBLEMS FOR A PERSONS HEALTH***** ***LOOK UP DIAGRAMS AND FAMILIARISE***** 15 of 15
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