Check the valves. Check the valves on the backflow device to make sure they're open. Turn the valve on the horizontal pipe first, then the vertical pipe valve. Low water pressure will result in the sprinkler heads barely shooting water.In extreme cases, many of the heads won't even pop up.Start with the easiest solution.Make sure the valves at the backflow device are fully open.urn the valve on the horizontal pipe first, then the vertical pipe valve. Low water pressure will result in the sprinkler heads barely shooting water. In extreme cases, many of the heads won't even pop up. Start with the easiest solution. Make sure the valves at the backflow device are fully open.
1 Cyanide prevents the cells of the body from using oxygen. 2  When this happens, the cells die. 3  Cyanide is more harmful to the heart and brain than to other organs because the heart and brain use a lot of oxygen. Cyanide gas is less dense than air; so it will rise. 2  Cyanide prevents the cells of the body from using oxygen. 3  When this happens, the cells die. 4  Cyanide is more harmful to the heart and brain than to other organs because the heart and brain use a lot of oxygen.
On the other hand, the concentration of hydrogen cyanide may rapidly reach lethal levels if it is released in confined spaces. The most important toxic effect of hydrogen cyanide is by inhibiting the metal-containing enzymes. One such enzyme is cytochromoxidase, containing iron. This enzyme system is responsible for the energy-providing processes in the cell where oxygen is utilized, i.e., cell respiration. When cell respiration ceases, it is no longer possible to maintain normal cell functions, which may lead to cell mortality. Symptoms of cyanide poisoning vary and depend on, for example, route of poisoning, total dose and the exposure time. If hydrogen cyanide has been inhaled, the initial symptoms are restlessness and increased respiratory rate. Other early symptoms are giddiness, headache, palpitations and respiratory difficulty.