<prompt> After hyperventilation for some time holding the breath is dangerous sinceIt can lead to CO2 narcosisdue to lack of stimulation by CO2, anoxia can go into dangerous levelI-0O2 shift 0 dissociation curve to left.Alkalosis can lead to tetany  <response>: B i.e. Due to lack of stimulation by CO2, anoxia can go into dangerous level 