Excitation-contraction coupling in skeletal muscle cells requires the influx of
ID: 81133 • Letter: E
Question
Excitation-contraction coupling in skeletal muscle cells requires the influx of extracellular calcium ion. in smooth-muscle cells requires the influx of extracellular calcium ion in all kinds of muscle requires the release of calcium ion from the sarcoplasmic reticulum. Both A and B are correct Both B and C are correct. Smooth muscle contraction is mediated by the phosphorylation of ____, which occurs as a result of a chain of biochemical events including the binding of calcium ion to ___, ADP, calmodulin calmodulin, myosin actin, tropomyosin myosin, troponin myosin, calmodulin Which of the following statements regarding contraction in skeletal and smooth muscle is TRUE? In skeletal muscle, calcium ion mediates changes in thin filaments that lead to cross-bridge activity; in smooth muscle, calcium ion mediates changes in thick filaments that lead to cross-bridge activity In skeletal muscle, calcium ion binds to a regulatory protein on thin filaments, in smooth muscle, calcium ion binds to a regulatory protein on thick filaments. In skeletal muscle, calcium ion binds to troponin; in smooth muscle, calcium ion binds to calmodulin. Both A and C are true. All of the choices are true. Cardiac and smooth muscle share some characteristics, including desmosomes gap junctions pacemaker capability in some cells. B and C are true. All of the choices are true. Which of the following statements concerning the differences between action potentials in skeletal-muscle cells and in ventricular cardiac muscle cells is TRUE? Like skeletal-muscle cells ventricular cardiac-muscle cells have a resting membrane potent closer to the sodium equilibrium potential than to the potassium equilibrium potential. Unlike cells, the initial depolarization of ventricular cells is mainly due calcium influx, not sodium influx. ventricular cells, an influx of calcium After sodium influx through fast channels occurs in such calcium influx occurs after sodium influx in the skeletal-muscle cells. Action potentials in skeletal-muscle cells are longer in duration than action cardiac cells. All of the choices are true.Explanation / Answer
23) Excitation contraction coupling is the physiological process of converting an electrical stimulus to a mechanical response. It serves as the link between the action potential generated in the sarcolemmal process and the start of a muscle contraction. Excitation contraction couplong in both skeletal and smooth muscles require calcium ions for initiation of contraction. In both, calcium is released from the sarcoplasmic reticulum. But in smooth muscles, extracellular calcium also enters through calcium channels present in the membrane of the smooth muscle cell. So, the answer for this question is option (E) Both B and C are correct.
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