Question

question 2 (1 point)
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place the events in signal transduction from nerve to muscle contraction in correct order. 1. troponin binds to ca²⁺. 2. nerve impulse cause synaptic vesicles to discharge acetylcholine (ach) that binds to ach receptors in sarcolemma. 3. myosin binding sites bind to actin. 4. ca²⁺ ions release from sarcoplasmic reticulum. 5. adp + p release from myosin

1. 1, 2, 3, 4, 5
2. 2, 4, 1, 3, 5
3. 3, 2, 1, 4, 5
4. 4, 2, 3, 1, 5
5. none of the above are in correct order

Explanation:

• First, the nerve impulse causes synaptic vesicles to discharge acetylcholine (ACh) that binds to ACh receptors in sarcolemma (step 2).
• Then, \(Ca^{2+}\) ions release from sarcoplasmic reticulum (step 4).
• Next, troponin binds to \(Ca^{2+}\) (step 1).
• After that, myosin binding sites bind to actin (step 3).
• Finally, ADP + P release from myosin (step 5).

Answer:

1. 2, 4, 1, 3, 5