Windows 10: What is the $WINDOWS.~BT folder used for? This folder is used by the Windows 10 Updater, it contains update logs and files downloaded by the Windows update process. How to delete the $WINDOWS.~BT folder? The folder can be deleted e.g. when an upgrade from windows 7 / 8 to Windows 10 failed and you want to free up space on the hard disk.
Two Types of Receptors. There are two types of acetylcholine receptors (AChR) that bind acetylcholine and transmit its signal: muscarinic AChRs and nicotinic AChRs, which are named after the agonists muscarine and nicotine, respectively.
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). number of drugs target acetylcholine receptors, blockade of these receptors is associated with anticholinergic (parasympatholytic) effect, while stimulation causes activation of cholinergic (parasympathomimetic) effects.