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.
 Carbon monoxide binds to the hemoglobin, cutting â¦ off the oxygen  supply. Cyanide poisoning requires cyanide ions, and these ions  mess with an important enzyme in the mitochondria of the cell,  called cytochrome c oxidase.In this way, carbon monoxide prevents  the oxygen from getting to the cells, while cyanide prevents the  cells from generating the energy.he electron transport chain allows a great concentration of protons (H+ ions) to build up in the matrix of mitochondria so that they can diffuse back through a channel which in turn synthesises ATP. So basically cyanide stops the last step of cell respiration from occurring and as such inhibits ATP synthesis.