<prompt> Type 1 glomus cell secrete neurotransmitter because of oxygen sensitiveNa channelCl channelCa2 channelK channel  <response>: Type I glomus cells have O2 sensitive K channels, whose conductance is reduced in propoion to the degree of hypoxia to which they are exposed. This reduces the K efflux, depolarizing the cell and causing Ca2 influx, primarily L-type Ca2 channels. The Ca2 influx triggers action potentials and transmitter release, with consequent excitation. of the afferent nerve endings. The smooth muscle of pulmonary aeries contains similar O2-sensitive K channels, which mediate the vasoconstriction caused by hypoxia. This is in contrast to systemic aeries, which contain adenosine triphosphate ATP dependent K channels that permit more K efflux with hypoxia and consequently cause vasodilation instead of vasoconstriction. Ref: Ganongs Review of Medical Physiology, 23rd edition, page no: 628, 629 Ref image: 