WITS Personal Fitness Trainer Certification Practice Test

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Question: 1 / 20

What are the basic units of muscle contraction known as?

Actin and myosin

Myofibrils

Sarcomeres

The basic units of muscle contraction are known as sarcomeres. Sarcomeres are the smallest functional units within a muscle. They contain the proteins actin and myosin, which interact to produce muscle contraction through a process called the sliding filament model. When the sarcomeres shorten, the muscle fibers also shorten, leading to overall muscle contraction.

Understanding sarcomeres is essential because they are the structural repeat units that make up myofibrils, which are found within muscle fibers. Sarcomeres are responsible for the striated appearance of skeletal muscles and play a critical role in the muscle contraction cycle. By focusing on the individual sarcomeres, one can appreciate how the coordinated efforts of multiple sarcomeres contribute to the muscle's ability to generate force and movement.

Muscle fibers

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