What amount of muscle stretch or length produces the optimum muscle strength or

Question

What amount of muscle stretch or length produces the optimum muscle strength or active force? Explain the reason for the decrease in muscle strength (active force) after the optimum strength when the muscle is further stretched or lengthened? Relate to the interaction between the thin and thick filaments. SUMMATION AND TETANUS Single stimulus active force _____ Repetitive (2 times) single stimulus active force _____ Multiple stimulus (40 stimuli/second) active force ____ Which of the above three stimulation modes produces the strongest strength of muscle contraction or active force? What is the definition of summation?

Explanation / Answer

12. The force generated by the muscle depends on the length and the velocity. Optimum force is generated at muscle resting length and least amount of force is generated when stretched or shortened relative to the resting position.

13.The relationship between sarcomere length and force produced in the muscle, is modulated by overlapping of actin and myosin myofilaments.Sarcomere contraction causes, myosin heads attach to actin to form cross-bridges and thin filaments slide over the thick filaments as the heads pull the actin. This results in sarcomere shortening, creating the tension of the muscle contraction. If a sarcomere is stretched too far, causes insufficient overlap of the myofilaments and the less force will be produced. If the muscle is over-contracted, the potential for further contraction is reduced, which in turn reduces the amount of force produced. in short the tension generated in skeletal muscle is a function of the magnitude of overlap between actin and myosin myofilaments.

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