Figure 8 - Pathways involved in acetylcholine-induced contraction of esophageal circular smooth muscle.

AA, arachidonic acid ; cPLA₂, cytosolic phospholipase A₂; DAG, diacylglycerol; ERK, extracellular signal-regulated kinase; HSP, heat shock protein; M, muscarinic; MLC, myosin light chain ; P, inorganic phophate; PC-PLC, phosphatidylcholine phospholipase C; PKC, protein kinase C; PLD, phospholipase D; (Source: Harnett et al.,¹⁰⁷ with permission from the American Physiological Society.)