Please describe & explain the main parts of the pacemaker and action potential observed in the SA node. Millivolts +20 O -60 Why does this action potential look different than that of a neuron in the nervous system? During what portion of this action potential is there contraction of the myocardiocyte? Voltage gated ca+ channels Compare the electrical activity above with the action potential observed in the average cardiomyocyte (below). +20 Millivolts 0 -20 -40 -60 he channels na -80 -100 pacemaker potentials CHCN channels Time- Nat in сад+ in (slow) K+ out 0 50 100 150 200 250 300 350 400 Milliseconds

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