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Given below are the diagrammatic sketches of two kinds of blood vessels.(a) Identify the two kinds of blood vessels A and B.(b) name the parts numbers 1 to 6(c) Mention any two main differences between A and B. |
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Answer» (a) A is artery, B is vein. (b) 1- Endothelium of the artery, 2 - Middle layer of smooth muscles and elastic fibres of the artery, 3 - External layer of connective tissue of the artery, 4 - Endothelium of the vein, 5 - Middle layer of smooth muscles and elastic fibres of the vein, 6 - External layer of connective tissue of the vein. (c) An artery has thick muscular walls and a narrow lumen. It carries blood away from the heart towards any organ. A vein on the other hand has thin muscular walls and a wider lumen. It carries blood away from an organ towards the heart. |
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