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.
ACh, which binds to nicotinic receptors, is the neurotransmitter at these sites as found in the other autonomic ganglia. Postganglionic sympathetic fibers then travel from the prevertebral ganglia to innervate tissues such as blood vessels where they release norepinephrine as the primary neurotransmitter.