what are the roles of the following in the process of muscle contraction: sarcol
ID: 169407 • Letter: W
Question
what are the roles of the following in the process of muscle contraction: sarcolemna, SR, neuron, actin, myosin, T-tubules, Ach, calcium, sodium, ATP? What are the general steps, at the molecular level, of sarcomere contractions and relaxation? what are the roles of the following in the process of muscle contraction: sarcolemna, SR, neuron, actin, myosin, T-tubules, Ach, calcium, sodium, ATP? What are the general steps, at the molecular level, of sarcomere contractions and relaxation? what are the roles of the following in the process of muscle contraction: sarcolemna, SR, neuron, actin, myosin, T-tubules, Ach, calcium, sodium, ATP? What are the general steps, at the molecular level, of sarcomere contractions and relaxation?Explanation / Answer
role of sarcolemma - Sarcolemma performs a important role in muscle contraction process , when the muscle action potential travels along the sarcolemma of muscle fibers , then into the transverse tubules ,calcium ions are released. sarcolemma is the cell membrane that encloses each muscle cell . role of SR - The sarcoplasmic reticulum (SR) in a muscle cell stows the calcium ions needed for contraction. the SR also helps align the force-producing myofibrils within a muscle fiber. role of neuron - Muscle contraction begins when the nervous system generates a signal. The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron. The neuromuscular junction is the name of the place where the motor neuron reaches a muscle cell. Skeletal muscle tissue is composed of cells called muscle fibers. When the nervous system signal reaches the neuromuscular junction a chemical message is released by the motor neuron. The chemical message, a neurotransmitter called acetylcholine, binds to receptors on the outside of the muscle fiber. then starts a chemical reaction within the muscle. role of actin and myosin - Muscle contraction thus results from an interaction between the actin and myosin filaments that generates their movement relative to one another. The molecular basis for this interaction is the binding of myosin to actin filaments, allowing myosin to function as a motor that drives filament sliding. role of T-tubules - The function of T-TUBULES is to conduct impulses from the surface of the cell (SARCOLEMMA) down into the cell and, specifically, to another structure in the cell called the SARCOPLASMIC RETICULUM. role of calcium - The calcium ions then flow into the cytoplasm and bind to the troponin and tropomyosin molecules in the actin filaments of the muscle cells. The binding of calcium allows the troponin to change shape and expose the actin-myosin binding site. role of sodium - Sodium and potassium help nerve cells to send electrical signals, called action potentials, that signal for your muscles to contract. role of ATP - ATP then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site. ATP can then attach to myosin, which allows the cross-bridge cycle to start again; further muscle contraction can occur.
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