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.
Several factors influence whether drinking water leads to temporary stomach bloating, including the volume of water you consume and how quickly; what else is in your stomach; and whether your intestines are also full. On an empty stomach, one or two 8-ounce glasses of water are unlikely to cause noticeable bloating. In contrast, a quart or more of water consumed quickly with other food or liquid already in your stomach, may lead to some distension of your abdomen.