Biology · Locomotion and Movement
A patient is diagnosed with a condition in which motor neurons degenerate and fail to release acetylcholine. Which of the following molecular events in muscle contraction will be directly and primarily affected first?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Actin filaments permanently detach from the Z-disc
- 2Troponin cannot bind Ca2+ because the SR is structurally damaged
- 3No action potential is generated on the sarcolemma, so Ca2+ is not released from the SR✓
- 4ATP hydrolysis by the myosin head is inhibited
Correct answer
No action potential is generated on the sarcolemma, so Ca2+ is not released from the SR
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