in contrast with normal heart in which a ca2+-free perfusion revealed a na+ , k+-atpase activity highly sensitive to ouabain , in hypertrophied heart , a pretreatment plus or minus ca2+ did not affect the high sensitivity form ( half maximum inhibition with 0.8-2.2 x 10 ( -9 ) m ouabain ) .
C0018787
heart
C0018800
hypertrophied heart