The amount of active tension (force) a muscle produces when contracting is greatest when the length of the muscle is:

Question

BlackTom AI · Accepted Answer

The question asks about the length of a muscle at which the amount of active tension produced during contraction is greatest.
Since the provided data shows only one listed answer, we will analyze that option and discuss general concepts related to the length–tension relationship.
Option: 'close to resting length (100%) or slightly stretched (110%)' This reflects the idea that the peak active tension occurs near the muscle’s resting length, where the overlap of actin and myosin filaments allows for the most cross-bridge formation. At 100% length, thin and thick filaments align to maximize cross-bridge cycling, yielding the highest active tension. A slight stretch to about 110% can maintain substantial actin–myosin overlap while not overly reducing cross-bridge opportunities, so some sources describe the region around resting length as still favorable, though performance typically declines if length increases too much.
Option critique: There are no other options provided to compare, so we cannot evaluate alternative length scenarios. In general, if the muscle is shorter than resting length, filament overlap becomes excessive and active tension decreases due to for example filament interference; if it is significantly longer than resting length, overlap diminishes and active tension drops sharply. The classic length–tension curve shows a peak near L0 (resting length) with declines on either side, and passive tension begins to contribute when stretched beyond optimal length.
In summary, the statement aligns with the common understanding that maximal active tension is achieved near resting length, potentially extending slightly beyond that range before major declines in cross-bridge formation occur. The absence of additional options prevents a fuller comparative analysis, but the principle described is consistent with the typical active force generation pattern in skeletal muscle.

2025FA-HES-207-001 B. ONQ#5

The amount of active tension (force) a muscle produces when contracting is greatest when the length of the muscle is:

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