The toe region: the wavy collagen fibers straighten. Considerable deformation without the use of much forceThe range where most functional activity normally occursElastic phase: stretched tissue returns to its original configuration once the external force removedStrain is directly proportional to the ability of the tissue to resist the forcePlastic phase: permanent elongation of the stretched tissue occurs when the external force removedSequential failure of the bond between collagen fibrils The rupturing of fibers that results in increased lengthFailure of tissue begains as microfailure of fibrils and fibers before complete failure of the tissue occurs