Inside muscles large concentration of protein is present .
Is muscle made up of protein?
Muscles are composed of about 80% protein. Protein is the main component of muscles, bones, organs, skin, and nails.
What is muscle made of ?
An individual muscle fiber is made up of blocks of proteins called myofibrils, which contain a specialized protein (myoglobin) and molecules to provide the oxygen and energy required for muscle contraction.
Hence , A is correct option
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