<prompt> All the following are features of Cardiac muscle ExceptStriatedLarge T tubulesTroponin system presentCaldesmon is impoant regulatory protein  <response>: Some Differences among Skeletal, Cardiac, and Smooth MuscleNoSkeletal MuscleCardiac MuscleSmooth Muscle1StriatedStriatedNonstriated2No syncytiumSyncytialSyncytial3Small T tubulesLarge T tubulesGenerally rudimentary T tubules4Sarcoplasmic reticulum well developed andCa2 pump acts rapidlySarcoplasmic reticulum present andCa2 pump acts relatively rapidlySarcoplasmic reticulum often rudimentaryand Ca2 pump acts slowly5Plasmalemma contains few hormonesreceptorsPlasmalemma contains a variety ofreceptors eg, a- and b-adrenergicPlasmalemma contains a variety ofreceptors eg, a- and b-adrenergic6Nerve impulse initiates contractionHas intrinsic rhythmicityContraction initiated by nerve impulses,hormones, etc7Extracellular fluid Ca2 not impoant forcontractionExtracellular fluid Ca2 impoant forcontractionExtracellular fluid Ca2 impoant forcontraction8Troponin system presentTroponin system presentLacks troponin system; uses regulatoryhead of the myosin9Caldesmon not involvedCaldesmon not involvedCaldesmon is impoant regulatory protein10Very rapid cycling of the cross-bridgesRelatively rapid cycling of the cross bridgesSlow cycling of the cross-bridges permitsslow, prolonged contraction and lessutilization of ATPRef: Harper;s Biochemistry; 30th edition; Chapter 51; Muscle the cytoskeleton; Table 51-3 