Answer :
Final answer:
The ability of muscle to shorten forcibly when adequately stimulated is known as contractility. It is a result of the sliding filament model of muscle contraction. The amount of tension produced by a muscle depends on the length of the sarcomere and the number of cross-bridges formed between actin and myosin.
Explanation:
The ability of muscle to shorten forcibly when adequately stimulated is known as contractility. When a skeletal muscle fiber contracts, myosin heads attach to actin to form cross-bridges followed by the thin filaments sliding over the thick filaments as the heads pull the actin, resulting in sarcomere shortening and the generation of muscle tension. The length of the sarcomere and the number of cross-bridges formed determine the amount of tension produced by a muscle.
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Final answer:
Contractility is the term that describes the ability of a muscle to forcibly shorten when adequately stimulated. It is a feature of muscular tissue that enables our body movement by converting chemical energy into mechanical work.
Explanation:
The ability of a muscle to forcibly shorten when it is adequately stimulated is known as contractility. This characteristic feature of muscular tissue, especially the skeletal ones, enables us to move our bodies in response to stimuli. This happens due to conversion of chemical energy (obtained from the metabolism of food) into mechanical work. For instance, when you decide to lift a weight, your brain sends a signal via neurons to the muscles in your arm. These signals trigger a sequence of events that leads to the contractile proteins in muscle fibers (actin and myosin) to interact and slide past each other, making the muscle contract or shorten forcibly.
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