<prompt> Enzyme level increases in tissue injury is due toLysis of cellEnzyme secretionNo inhibitor in serumAll of the above  <response>: In cell injury, there is increased membrane permeability leading to membrane damage. 1.Mitochondrial membrane damage-decreased ATP production 2.Plasma membrane damage- loss of osmotic balance and influx of ions and fluids. 3.Lysosomal membrane damage results in leakage of enzymes into the cytoplasm and activation of acid hydrolases in the acidic intracellular pH of the injured cell. Lysosomes contain RNases, DNases, proteases, glucosidases and other enzymes.Activation of these enzymes leads to enzymatic digestion of cell components. Refer robbins 9e p39 