If a stimulus, several times greater than the thresth...

If a stimulus, several times greater than the thresth stimulus, is provided to a muscle fibre, it will
(a) contract with a larger force
(b) contract with a smaller force
(c) contract with the same force
(d) undergo tetany.

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Key Concepts

All-or-None Principle

This principle states that once a muscle fiber reaches its threshold level of excitation, it contracts fully, regardless of whether the stimulus is just at threshold or several times greater. The response of the muscle fiber is not graded by the strength of the stimulus, meaning that there is a complete contraction rather than a partial one when the stimulus exceeds the threshold.

Threshold Stimulus

The threshold stimulus is the minimum amount of stimulation needed to trigger an action potential in a muscle fiber. It plays a critical role in muscle physiology, as the fiber will only respond by contracting if the stimulus meets or exceeds this minimum level, ensuring that only adequately strong signals lead to contraction.

Suprathreshold Stimulation

When a stimulus is stronger than the threshold level, it is known as a suprathreshold stimulus. In muscle fibers, a suprathreshold stimulus does not produce a stronger contraction than a threshold stimulus due to the all-or-none nature of their response. This ensures that the fiber produces a full contraction once the threshold is met, irrespective of how much the stimulus exceeds it.

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