Multiple choice

Which of the following is regarded as a basic unit of a muscle?

  1. Melanosome

  2. Mitosome

  3. Myofibril

  4. Nucleolus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A myofibril is a basic unit of a muscle. Muscles are composed of tubular cells called myocytes or myofibers. Myofibers are composed of tubular myofibrils. Myofibrils are composed of long proteins such as actin, myosin, and titin, and other proteins that hold them together.

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