The figure below shows the two main families of acetylcholine receptors: muscarinic and nicotinic. In structural terms, muscarinic receptors are G-coupled protein receptors, while nicotinic receptors are ligand-gated ion channels. They can be found on both sides of the synaptic cleft (presynaptic and postsynaptic).
After the pressure drops below 40 psi, the electrical switch turns on the pump and the pressure in the tank increases. Any failure in any component or loss of electricity can cause a well to suddenly stop producing water when a faucet is turned on.
Cloudy Water. There are two very common, non harmful causes of cloudy water and one serious cause. In most cases, air bubbles or very fine particles of matter, such as dirt or organic matter get mixed in your drinking water. In very unusual cases, methane gas can cause this cloudy effect. Air Bubbles.