Biology-B2-Blood Vessels 0.0 / 5 ? BiologyCirculationGCSEAQA Created by: tonisha_Created on: 16-06-21 18:55 What are the three main blood vessels? arteries veins and capillaries 1 of 21 What is the job of the arteries? to carry blood away from the heart 2 of 21 What is one main adaptation of the arteries? it has a thick muscular wall 3 of 21 Why does it have a thick muscular wall? due to blood flowing out of heart entering arteries with high pressure this allows arteries to deal with high pressure as the walls stretch 4 of 21 What is another adaptation of the arteries? elastic fibres 5 of 21 What are the elastic fibres for? responds to the force of the blood causing blood flow to be smoother 6 of 21 What other two adaptations does the arteries have? a small lumen and smooth lining 7 of 21 What is a lumen? hollow space where the blood flows through 8 of 21 Why do arteries not need valves? force of heartbeat keeps blood flowing in right direction (away from the heart) 9 of 21 What is the role of the capillaries? supply nutrients and oxygen to the cells in the body and to remove waste products 10 of 21 What is an example of a waste product? Carbon dioxide (CO2) 11 of 21 What is a key adaptation of the capillaries? the walls are made up of one single layer of cells 12 of 21 What is its purpose? allows shorter diffusion path and speeds up the exchange of materials 13 of 21 The capillaries are narrow. What does this mean? the blood cells have to pass through in single file 14 of 21 What do the capillaries join up? the veins and arteries 15 of 21 What is the role of the veins? to carry blood towards the heart 16 of 21 What is one adaptation of the veins? thin outer wall 17 of 21 Why do veins have a thin outer wall? blood is flowing at low pressure this means blood is flowing slowly and calmly 18 of 21 What is another adaptation of veins? they have a large lumen 19 of 21 What else do veins have that arteries and capillaries dont? valves 20 of 21 Why do veins have valves? to prevent the backflow of blood 21 of 21
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