31. The constant backflow of blood through the leaky aortic valve implies that there is no true phase of isovolumic relaxation. 32. The constant backflow of blood through the leaky mitral valve implies that there is no true phase of isovolumic contraction. 33. "Backflow devices are not present on all potable water hydrants, " the FDA said in the letter. 34. The flow cannot be halted because that would cause a backflow of sewage into the city's roads and homes. 35. Periodic on-line pressure pulses or backflow can be effective if the capability is carefully incorporated at the design time. 36. "Reflux " in this context means backflow of the circulatory system and is not to be confused with reflex 37. While a small amount of backflow may occur ordinarily, it is usually only shown on an echocardiogram and is harmless. 38. A rubber diaphram, broken as propellant pressure builds, ensures that there is no backflow through the combustion chamber either. 39. Reclaim regulators are also sometimes used for hazmat diving to reduce the risk of backflow through the exhaust valves into the helmet. 40. The beach and canal frequently suffer from litter pollution and the canal has a distinctive smell resulting from the backflow of seaweed.
