(a) Characteristic rapid rise, rapid shedding (~2 sec), rapid (RAR: ~50 sec) active recovery, plateau, and gradual (GAR: ~1000 sec) active recovery of tissue tension in a preconditioned tissue construct. (b) The extracellular matrix (ECM) contribution to overall tissue construct response, estimated by removing cells through treatment with Triton 100-X. The ECM response was entirely passive. (c) The cellular response, estimated by subtracting Figure 1b from Figure 1a.