<prompt> Earliest event in ischemic cardiac myocytes is:Microvascular injuryIrreversible cell injuryLoss of contractilityATP reduction to 50 normal.  <response>: Loss of contractility Features Time Onset of A TP depletion Seconds Loss of contractility 2 min A TP reduced to 50 of normal to 10 of normal 10 min 40 min Irreversible cell injury 20-40 min Microvascular injury 1 hour 