Muscle Questions Essay

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Study Questions for muscle 1. Long fibers, striated, nucleus is peripherally located (multiple nuclei’s along the fiber) Muscular Fasica = Surrounds the individual muscles and groups of muscles (red, layer 1) Epimysium = Surrounds the muscles (dark blue, layer 2) Perimysium = Surrounds the fasciculi (light blue ring, layer 3) Endomysium = Surrounds the muscle fibers (light blue around orange, layer 4) Aponeurosis: Tendons that are broad and sheet-like 2. A muscle cell is also called a (Muscle Fiber). The plasma membrane of the muscle cell is called a (Sarcolemma). 3. The role of the sarcoplasmic reticulum releases calcium ions that will cause the troponin/ tropomyosin complex to move. This will expose the binding sites on actin so that the cross-bridges of myosin can bind to it. *High calcium concentrations = concentration occurs (bind to troponin – moves tropomyosin out of the way to reveal the hidden receptor site) *Low calcium concentrations = concentration does not occur (troponin goes back – move the tropomyosin back in the way of the myosin = blocks). (Calcium ions) are stored in the Sarcoplasmic reticulum. 4. The cause for the release of Calcium is the depolarization of the T-tubules. (Acetylcholine enters the synaptic cleft gap and opens the chemically gated sodium channel that starts an action potential spreading down the sarcolemma of the myofibril. This will cause an action potential to spread down to the T- tubules and “electrical chemical signals = shocks” the sarcoplasmic reticulum into releasing calcium ions. Then the calcium is released from the sarcoplasmic reticulum to the sarcoplasm. 5. Calcium is restored/ reused in the sarcoplasmic reticulum. Just as concentration results from the release of calcium ions stored in the sarcoplasmic reticulum, contraction ends and relaxation begins as Calcium is

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