Fig. 3.

Bath application of BaCl₂ does not affect the hypoxic response. A₁, B₁, Traces recorded before, during, and 4 min after hypoxia in the absence (A₁) and presence (B₁) of BaCl₂ (1 mm). Note the substantial decrease in instantaneous current during perfusion with BaCl₂, whereas the hypoxia-induced increase inG_N and the block of inward relaxations remains in the presence of BaCl₂.A₂, B₂,I–V plots recorded before (A₂) and during (B₂) BaCl₂ application (data from same neuron as inA₁ and B₁, respectively).