心肌肌钙蛋白（cardiac troponin,cTn）,是骨纹肌的结构蛋白。（

Which of the following can combine with calcium? A: troponin B: myosin C: tropomyosin D: actin

骨骼肌细胞收缩的基本功能单位是() A: troponin B: sarcomere C: myosin D: actin

Which one of the following situations is not associated with the dysfunction of excitation-contraction coupling in myocardium? A: Acidosis B: The obstruction of L-type calcium channels C: The increased activity of myosin ATPase in myocardium D: The increased foetus troponin E: The decreased activity of sarco-endoplasmic reticulum calcium-ATPase