Chapter 12 - Chapter 12 - Muscle Sarcomere Anatomy Myosin 1...

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1 Chapter 12 - Muscle Sarcomere Anatomy Myosin
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2 Sarcomere – Sliding Filament Theory • Myosin heads attach to actin • Myosin heads move, which causes (pulls) the actin filaments to slide together. •Hzone Motor Unit ± Each somatic neuron together with all the muscle fibers it innervates. ± Each muscle fiber receives a single axon terminal from a somatic neuron. ± Recruitment = for contractions of greater strength, larger motor units are recruited. Motor Units – Continued ± 1. When a muscle is composed of a relatively large number of small motor units (such as in the hand), there is fine control of muscle contraction. ± 2. The large muscles of the leg have relatively few motor units, which are correspondingly large in size. ± 3. Sustained contractions are produced by the asynchronous stimulation of different motor units.
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Neuromuscular Junction 1) Neuron action potential 2) Acetylcholine release 3) Sarcolemmal action potential 4) T-Tubule carries A.P. into fiber 5) A.P. excites release of Calcium
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Chapter 12 - Chapter 12 - Muscle Sarcomere Anatomy Myosin 1...

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