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| Question | Answer |
| What are the 5 types of blood vessels? | Arteries Arterioles Capillaries Venules Veins |
| What is the structure of arteries? |
Elastic tissue stretches and recoils to maintain the high pressure
The endothelium is folded to allow the artery to expand
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| What is the function of arteries? | Arteries carry blood from the heart to the rest of the body |
| What is the structure of arterioles? | Arteries branch into arterioles, which are smaller than arteries They have smooth muscle, but less elastic tissue The smooth muscle allows them to expand/contract, controlling the amount of blood flowing |
| What is the structure of capillaries? |
Arterioles branch into capillaries
They are one cell thick
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| What is the function of capillaries? | Substances like C₆H₁₂O₆ and O₂ are exchanged between cells and capillaries |
| What is the structure of venules? | Capillaries connect to venules, which have very thin walls that contain some muscle cells They join to form veins |
| What is the structure of veins? |
They have a wider lumen and contain valves to prevent backflow
They have little elastic or muscle tissue
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| What is the function of veins? | Veins take blood back under low pressure Blood flow is helped by contraction of nearby body muscles |
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