<prompt> Which of the following ions is involved in peripheral oxygen sensing chemoreceptors?PotassiumCalciumSodiumChlorine  <response>: Potassium is involved in peripheral oxygen sensing chemoreceptors. Type I glomus cells carotid and aoic body have O2- sensitive K channels, whose conductance is reduced in propoion to the degree of hypoxia. This reduces the K efflux, depolarising the cell and causing Ca2 influx. The Ca2 influx triggers action potentials and consequent excitation of the afferent nerve endings. Ref: Ganong;s Review of Medical Physiology 26th edition Pgno: 648 