PHYSIOLOGY
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -"Thick filaments are composed of actin.” This statement is false. Thin filaments (not thick) are made of actin protein subunits. Thick filaments are made of myosin proteins.
Detailed explanation-2: -Thick filament is made up of a protein called Myosin. Each myosin (thick filament) is made up of Many monomeric proteins called Meromyosins. Hence Major protein in the thick filaments of skeletal muscle fiber is Myosin. So, the correct answer is ‘Myosin’.
Detailed explanation-3: -In addition to myosin that makes up the backbone of the thick filament, four other proteins which are intimately bound to the thick filament, myosin binding protein-C, titin, myomesin, and obscurin play important structural and regulatory roles.