BPK 325 Chapter Notes - Chapter 4: Pivot Joint, Orbicularis Oculi Muscle, Dermis

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Similar characteristics excitability (muscle has ability to be excited via nervous stimuli), elasticity (muscle can return to original length), extensibility (can stretch/extend), contractility (muscle tissue can pull on attachment points and shorten with force) Skeletal muscle tissue layers (from outside to inside) Epimysium (covers skeletal muscle) perimysium and endomysium (covers muscle fascicle) sarcolemma (covers muscle fibers) Each individual muscle fibre can contract due to presence of myofibrils. From muscle to bone: collagen of mysia collagen of tendon periosteum. Tension created by contraction is transferred from mysia to periosteum (pulling on bone for movement) In other places, mysia may fuse with broad tendon-like sheet called the aponeurosis (fascia) Sarcoplasmic reticulum (sr) = specialized smooth er. Functional unit = sarcomere (made up of actin and myosin filaments) and troponin and tropomyosin (support proteins) Muscle tension = force generated by contraction of muscle (or shortening of sarcomeres) or when muscle contracts without the load moving.

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