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Folds are created in rock when they experience compressional stress. This is when the rock is being pushed inward from both sides. This is like if you put a spring between your hands and push them together. As you push, you're compressing the spring, and rock can be compressed in the same way over long periods of time.
Upon hard contraction, for example, the vocal folds become more viscous and a greater amount of air (from the respiratory system) is needed to set them into motion. The Lamina Propria (made up of three layers) is a little more pliable than the vocalis muscle. This allows for more ease of vibration throughout the vocal fold. The most superficial layer is the epithelium, or epithelial tissue (found throughout the entire body). The thin layer of tissue is the least viscous of the three major layers and, therefore, most easily set into motion or vibration.