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Green: physiological cross-section. In skeletal muscle tissue, 10-100 endomysium-sheathed muscle fibers are organized into perimysium-wrapped bundles known as fascicles. Each muscle is composed of a number of fascicles grouped together by a sleeve of connective tissue, known as an epimysium. In a pennate muscle, aponeuroses run along each side ...
Figure 1 Pennate muscle fiber arrangements. The green lines represent PCSA; the blue lines represent ACSA. In muscle physiology, physiological cross-sectional area (PCSA) is the area of the cross section of a muscle perpendicular to its fibers, generally at its largest point.
Since pennate fibers insert at an angle, the anatomical cross-sectional area cannot be used as in parallel fibered muscles. Instead, the physiological cross-sectional area (PCSA) must be used for pennate muscles. Pennate muscles can be further divided into uni-, bi- or multipennate. Fiber angle of a pennate muscle
Bipennate muscle is stronger than both unipennate muscle and fusiform muscle, due to a larger physiological cross-sectional area. Bipennate muscle shortens less than unipennate muscle but develops greater tension when it does, translated into greater power but less range of motion. Pennate muscles generally also tire easily
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Tech billionaire Elon Musk labeled a section of President-elect Trump supporters as “contemptible fools” as the online debate around visas for highly skilled workers on the right intensifies.
In terms of ring-tailed lemurs specifically, there is a large number of them living in Amoron’i Onilahy, a protected area on the island known for its biodiversity. About Their Flirting Method
The fibers in pennate muscles run at an angle to the axis of force generation. [29] This pennation angle reduces the effective force of any individual fiber, as it is effectively pulling off-axis. However, because of this angle, more fibers can be packed into the same muscle volume, increasing the physiological cross-sectional area (PCSA). This ...