A physiologist applies a toxin to an isolated skeletal muscle preparation that blocks Ca2+ binding to troponin, but does not affect Ca2+ release from the sarcoplasmic reticulum. The muscle is then electrically stimulated. Which of the following observations is most likely?

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Biology · Locomotion and Movement

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Ca2+ accumulates in the sarcoplasm, but no effective contraction occurs

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Answer 1

The muscle undergoes irreversible continuous contraction

Answer 2

Myosin heads cannot hydrolyze ATP, so no power stroke occurs

Answer 3

Ca2+ accumulates in the sarcoplasm, but no effective contraction occurs

Answer 4

Normal cross-bridge cycling occurs, but relaxation is delayed

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