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2014-06-24T17:21:04+08:00

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Aside from they're both inside the body, they're both related to veins
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2014-06-25T19:29:33+08:00

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1) Both are blood vessels
2) They can contract and expand soft and fast
3) They do not fatigue in a way muscles do
4) Both have 3 layers
   i. outer tissue
   ii. muscular middle layer
   iii. inner epithelial cells
5) both are formed of smooth muscles
6) both are linked to the heart
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