In humans, the products of anaerobic respiration are adenosine triphosphate (ATP), carbon dioxide and lactic acid. ATP is the molecule that provides energy to cells.
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.he muscarinic AChRs occur primarily in the CNS, and are part of a large family of G-protein-coupled receptors (G proteins), which use an intracellular secondary messenger system involving an increase of intracellular calcium to transmit signals inside cells.
Nicotinic receptors. Unlike muscarinic receptors (which are G-protein coupled receptors), nicotinic receptors are ligand-gated ion channels. When bound to acetylcholine, these receptors undergo a conformational change that allows the entry of sodium ions, resulting in the depolarization of the effector cell. number of drugs target acetylcholine receptors, blockade of these receptors is associated with anticholinergic (parasympatholytic) effect, while stimulation causes activation of cholinergic (parasympathomimetic) effects.