Biology · Human Physiology - Muscle Contraction Steps
Arrange the following events in the correct chronological order during initiation of a muscle contraction: I. Tropomyosin shifts position, exposing actin active sites II. Action potential propagates along T-tubules III. Acetylcholine is released at the neuromuscular junction IV. Ca2+ binds to troponin V. Ca2+ is released from the sarcoplasmic reticulum
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1II → I → V → IV → III
- 2III → V → II → IV → I
- 3II → III → V → IV → I
- 4III → II → V → IV → I✓
Correct answer
III → II → V → IV → I
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