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3140 Physiology

What is staircase effect in muscle contraction

AAfter long period of rest, initial strength of contraction is less than few concentrations later (Correct Answer)
BAfter long period of rest, initial strength of contraction is more than few concentrations later
CAfter long period of work, strength of contraction is less than few concentrations later
DAfter long period of work, strength of contraction is more than few concentrations later