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The muscle cross-sectional area (blue line in figure 1, also known as anatomical cross-section area, or ACSA) does not accurately represent the number of muscle fibers in the muscle. A better estimate is provided by the total area of the cross-sections perpendicular to the muscle fibers (green lines in figure 1).
[2] [3] This further allows for more fibers to be present in a given muscle; however, a trade-off exists between the number of fibers present and force transmission. [ 3 ] [ 8 ] The force produced by pennate muscles is greater than the force produced by parallel muscles. [ 3 ]
Although delayed onset muscle soreness is a symptom associated with muscle damage, its magnitude does not necessarily reflect the magnitude of muscle damage. [ 2 ] : 66–67 Soreness is one of the temporary changes caused in muscles by unaccustomed eccentric exercise.
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A drawing of a butterfly with bilateral symmetry, with left and right sides as mirror images of each other.. In geometry, an object has symmetry if there is an operation or transformation (such as translation, scaling, rotation or reflection) that maps the figure/object onto itself (i.e., the object has an invariance under the transform). [1]
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The type of symmetry is determined by the way the pieces are organized, or by the type of transformation: An object has reflectional symmetry (line or mirror symmetry) if there is a line (or in 3D a plane) going through it which divides it into two pieces that are mirror images of each other. [6]