EHS 230 Lecture Notes - Lecture 1: Myofibril, Sliding Filament Theory, Neuromuscular Junction
11 Mar 2017
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Runs along with tendons, that are attached to exterior bone layer. Runs with sarcolemma ( exterior layer of muscle fiber) Muscle contraction depends on all these structures to successfully move and increase bone strength. The ar(cid:373)"s origi(cid:374) is atta(cid:272)hed to the shoulder. The ar(cid:373)"s i(cid:374)sertio(cid:374) is the joi(cid:374)t (cid:271)etween the arm and the hand. Allow muscles to contract if the actin and myosin are stimulated. Motor unit- it is a motor neuron and includes the fibers that it controls. Myofibrils- many myofibrils are located in one muscle fiber. Single fibrils do not have a neuromuscular junction. They depend on electricity to transport a stimulus from one location to the next. Actin and myosin- these are contractile parts of myofibrils. When the impulse gets to the neuromuscular junction, it causes a reaction. The reaction results in cross bridges binding between actin and myosin filaments. The cross bridges allow the z-discs to be pulled towards each other to contract the muscle.
