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It’s your first day of residency in the emergency room and a woman comes in who cannot move her arm after lifting heavy weights. You can’t find the consulting physician anywhere. You quickly review your knowledge of muscle structure and function…
In general, skeletal muscles attach to bone pulling on it to move the body. The effect is motion under voluntary control like walking and lifting weights. The biceps brachii skeletal muscle, biceps for short, flexes the forearm. Small changes at the protein level drive motion through the muscle myofilament, myofibril, fiber and fascicle hierarchy to culminate in whole muscle contraction.