Final answer:
The Myoelastic-Aerodynamic Theory assumes that vocal fold tissues behave elastically, surface tension is determined by myosin motor activity and remains constant, and line tension is influenced by the stretching of the actin cortex, in addition to contributions from non-linear elasticity and active molecular motor-induced tension.
Step-by-step explanation:
The Myoelastic-Aerodynamic Theory is a conceptual model addressing the physics of vocal fold vibration during phonation. It includes a set of basic assumptions grounded on biomechanics and fluid dynamics:
- The vocal fold tissues are capable of elastic behavior, storing and releasing energy much like other biological materials that exhibit elastic properties.
- Surface tension, determined by myosin motor activity in the cytoskeleton, is a critical component and remains constant for all arc-like configurations within the vocal folds.
- Line tension is influenced by the mechanics of the peripheral bundles due to the stretching of the actin cortex.
- The theory also posits that there is a contribution from non-linear elasticity and active molecular motor-induced tension which are integral to the overall stability and dynamic behavior of the vocal folds.
These assumptions are significant when modeling phenomena such as the aerodynamics behind speaking or singing where the stable vibration pattern of the vocal folds transforms airflow into sound waves.