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Question

The proteins found in the filaments of muscle fibres are

A
Actin and myosin
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B
Myosin and elastin
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C
Actin only
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D
Myelin and tubulin
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Solution

The correct option is A Actin and myosin
Skeletal muscle is composed of muscle fibres which have smaller units called myofibrils. There are three types of proteins make up each myofibril; they are contractile, regulatory and structural proteins. By contractile proteins, we mean actin (thin filament) and myosin (thick filament).
So, the correct option is 'actin and myosin'.

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