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The secretory response to hypoxia of glomus cells depends on extracellular Ca2+ influx. (Upper) Reversible abolishment of the response to hypoxia during the blockade of Ca2+ channels by addition of 0.2 mM CdCl2 to the extracellular solution. (Lower) Reversible abolishment of the response to hypoxia by the removal and chelation of Ca2+ from the extracellular solution.
