In tissue mechanics, how is stress defined?

In tissue mechanics, how is stress defined?

• A. Internal reaction to external load
• B. External load applied to tissue
• C. Rate of deformation
• D. Tissue temperature

Answer: (A)

Stress is the internal reaction of tissue to externally applied loads. It represents the internal forces distributed across imaginary planes inside the tissue that resist the external loading. In a simple uniaxial pull, stress equals the applied force divided by the cross-sectional area (F/A). The external load is what you apply to cause deformation, but stress is the tissue’s internal response to that load. The rate of deformation describes how quickly the tissue deforms (strain rate), not the internal forces. Temperature can influence material properties but does not define stress.

Stress is the internal reaction of tissue to externally applied loads. It represents the internal forces distributed across imaginary planes inside the tissue that resist the external loading. In a simple uniaxial pull, stress equals the applied force divided by the cross-sectional area (F/A). The external load is what you apply to cause deformation, but stress is the tissue’s internal response to that load. The rate of deformation describes how quickly the tissue deforms (strain rate), not the internal forces. Temperature can influence material properties but does not define stress.