Answers

2016-07-10T19:54:21+08:00
The blood in the veins might move backward.
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2016-07-10T19:55:36+08:00
It can become clog or the blood will be hold up heart which can worsen the flow in the valve.A valve can leak(regurgitation),which makes the blood go backwards. An example of a disease which is caused by the leakage of the heart that will cause the inner lining of some arteries to inflame is rheumatic heart disease. 
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