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61. All are features of skeletal muscle except______________?

A. Cylindrical
B. Transverse striation
C. Centrally placed nuclei
D. Multiple nuclei

62. Rigor mortis results after death is due to________________?

A. Failure of acetylcholine to diffuse
B. Failure of ATP supply
C. Failure of break down of calcium bridges
D. None of the above

63. The skeletal muscle action potential______________?

A. Is not essential for contraction to occur
B. Has a prolonged plateau phase?
C. Spreads in ward to all parts of the muscle via the t- tubule system
D. Begins with an, in ward movement of K+ ins

64. Electromyography is used for________________?

A. To study muscle activity
B. Determine class II malocclusion
C. Determine the centric relation
D. Determine the centric occlusion

65. Skeletal muscles______________?

A. Contracts when calcium is taken up by sarcoplasmic reticulum
B. Contracts when actin and myosin filaments shorten
C. Contraction is initiated by calcium binding to troponin
D. Contraction is initiated by calcium binding to tropomyosin

66. The contractile element in a skeletal muscle is present in______________?

A. Sarcolemma
B. Sarcoplasm
C. Myofibril
D. Endomysium

67. Which is caused by acetylcholine through nicotinic receptors_____________?

A. Contraction of skeletal muscle
B. Decrease of heart rate
C. Secretion of saliva
D. Contraction of pupils

68. Which one of the following is a regulatory protein of the muscle ?

A. Troponin
B. Myosin
C. Actin
D. Protein- C

69. Skeletal muscles_____________?

A. Contracts when calcium is taken up by sarcoplasmic reticulum
B. Contracts when actin and myosin filaments shorten
C. Contraction is initiated by calcium binding to troponin
D. Contraction is initiated by calcium binding to tropomyosin

70. Cardiac muscle contracts due to______________?

A. Extracellular Ca+2
B. Sarcoplasmic ca+2
C. Extracellular Na+
D. Intracellular Na+