Galvanic cell makes good.
D004566:Electrodes; D006330:Heart Defects, Congenital / Q000175:diagnosis; D006801:Humans; D008131:London; D010100:Oxygen / Q000032:analysis* / Q000097:blood; D010138:Pacemaker, Artificial; D010313:Partial Pressure; D011048:Polarography / Q000295:instrumentation*; D011095:Polyethylenes
D011095:Polyethylenes; D010100:Oxygen