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.
Later, the user may have feelings of paranoia and panic. The interaction of the THC with the brain is what causes these feelings. To understand how marijuana affects the brain, you need to know about the parts of the brain that are affected by THC.Here are the basics: 1  Neurons are the cells that process information in the brain. 2  Chemicals called neurotransmitters allow neurons to communicate with each other.ater, the user may have feelings of paranoia and panic. The interaction of the THC with the brain is what causes these feelings. To understand how marijuana affects the brain, you need to know about the parts of the brain that are affected by THC.