The contraction of muscle of shortest duratio | vedclass

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(D) The muscles of the eyelids exhibit the shortest duration of contraction among the given options.These muscles are responsible for the rapid blinki

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Eyelids

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(D) The muscles of the eyelids exhibit the shortest duration of contraction among the given options.These muscles are responsible for the rapid blinking reflex,which is an involuntary,quick movement designed to protect the eye from foreign particles or dryness.In contrast,cardiac muscles (heart) have a longer refractory period,intestinal muscles exhibit slow,rhythmic peristaltic contractions,and jaw muscles are involved in sustained chewing movements.

The contraction of muscle of shortest duration is seen in

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$A$: Application of stimuli repeatedly just at the start of relaxation of a muscle fibre shows an increase in the extent of contraction initially and results in treppe or staircase phenomenon.
$R$: It can be attributed to the summation effect of the sub-threshold stimuli being given again and again.

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