ACTION POTENTIALS FROM DIFFERENT AREAS OF THE HEART Fast and Slow response ATRIUM Ⅴ ENTRICLE 0 90mv 90mv SA NODE 80mv 7 time7 ACTION POTENTIALS FROM DIFFERENT AREAS OF THE HEART Fast and Slow Response mv 0 -90mv mv 0 -90mv mv 0 -80mv ATRIUM VENTRICLE SA NODE time