Which of the following step(s) about the excitation of skeletal muscle is/are incorrect?   1. Acetylcholine is released and binds to motor end plate receptors   2. An action potential is created and moves down T-tubules   3. Calcium is released from the sarcoplasmic reticulum   4. Calcium ions bind to tropomyosin to shift troponin off the binding sites for cross-bridging   5. Myosin forms cross-bridges and binds with actin to pull it towards middle of sarcomere

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Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.