State whether the following statements are true or false. Involuntary muscles have no myosin or actin since they lack striations.
A
True
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B
False
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Solution
The correct option is B False 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).