explain the structure of sarcomium
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When viewed under a microscope, muscle fibers of varied lengths are organized in a stacked pattern. The myofibril strands, thereby actin and myosin, form bundles of filament arranged parallel to one another. When a muscle in our body contracts, it is understood that the way this happens follows the sliding filament theory. This theory predicts that a muscle contracts when filaments are allowed to slide against each other. This interaction, then, is able to yield contractile force. However, the reason the sarcomere structure is so crucial in this theory is that a muscle needs to physically shorten. Thus, there is a need for a unit that is able to compensate for the lengthening or shortening of a flexing muscle.
The sliding filament theory was first posited by scientists who had used high-resolution microscopy and filament stains to observe myosin and actin filaments in action at various stages of contraction. They were able to visualize the physical lengthening of the sarcomere in its relaxed state, and the shortening in its contracted state. Their observations led to the discovery of sarcomere zones
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