Answer :
Through the cycling of actin and myosin cross-bridges, a muscle fibre produces tension.
The muscle may lengthen, shorten, or stay the same when under tension. Although the word "contraction" connotes shortening, it actually refers to the creation of tension within a muscle fibre when used in relation to the muscular system. The variations in muscle length during contractions distinguish a variety of muscle contractions.
Muscles shrink during a concentric contraction, which is a type of muscle contraction used to overcome resistance. A concentric contraction of the biceps, for instance, would force the arm to bend at the elbow when carrying a heavy object, moving the object towards the shoulder. Sarcomere, muscle fibre, and muscle are all compressed by cross-bridge cycling.
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