| 21. | Upward flow of blood in the veins is ensured by small one-way valves that prevent backflow.
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| 22. | With the exception of elimination, these are the only ways one can control backflow form taking place.
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| 23. | When pressure is removed, however, the duckbill end returns to its flattened shape, preventing backflow.
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| 24. | Float Shoes and Collars ( float valves ) prevent backflow after the cement has been pumped into place.
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| 25. | This feature allows the chlorine to travel through the water supply system, effectively controlling pathogenic backflow contamination.
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| 26. | This deforms the delicate valves designed to prevent backflow of blood, especially as pressure within the heart rises.
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| 27. | With gravel filters, self cleaners, elaborate and expensive experiments with hydraulics, aeration, pumps and backflow.
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| 28. | This is called a diode-OR circuit, designed to prevent backflow of current to the supplying device.
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| 29. | Sometimes, the backflow reaches as far as the mouth, where it can cause sore throats and tooth decay.
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| 30. | It is between the right atrium and the right ventricle, and stops the backflow of blood between the two.
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