Part C Which of the following events is the direct result of an action potential in the membrane of a muscle cell? ? View Available Hint(s) The myosin head extends. The muscle relaxes. Calcium ions are pumped into the endoplasmic reticulum (ER). The muscle cell's endoplasmic reticulum (ER) releases calcium ions. The myosin head detaches from actin. Submit Part D
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Describe how an action potential in muscle cells can lead to calcium release from the sarcoplasmic reticulum and a muscle contraction. Include the following terms in your description: a. Action potential b. Sarcoplasmic reticulum c. Voltage-gated calcium channel d. Ligand-gated ion channel (in SR membrane) e. Calcium pump f. Direction of calcium flow (in or out of the cytosol) g. Electrochemical Gradient h. Conformational Change
Madhur L.
All of the following statements are true regarding the action potential generated at the sarcolemma except A it triggers the release of calcium ions from the sarcoplasmic reticulum B It travels through the transverse tubules C It reaches the myofibrils within the muscle fiber D It triggers the release of acetylcholine from the sarcoplasmic reticulum
Which of the following best explains the cellular mechanisms involved in the process of summation in skeletal muscle contraction? a. Increased stimulation frequency results in higher turnover of ATP, which enables the buildup of a greater twitch force. b. Additional motor units are stimulated to contract due to an increase in stimulation frequency, which results in a greater force output from the muscle as a whole. c. Myosin is still bound to actin and the sarcomere is still partially contracted when the muscle is stimulated to contract again. This results in additive levels of force output because the next contraction begins from this state rather than from rest. d. The active transport of calcium ions back into the sarcoplasmic reticulum is accelerated with increased stimulation frequency. This results in longer interactions between actin and myosin, which generates greater muscle tension.
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