Question

69. Put the following events of excitation-contraction coupling in the order in which they occur: 1. Neural control, 2. Excitation, 3. Release of calcium ions, 4. Contraction cycle begins, 5. Sarcomere shortening, 6. Generation of muscle tension. 70. Put the following events of the contraction cycle in the order in which they occur: 1. Active site exposure, 2. Calcium ions bind troponin, 3. Cross bridge formation, 4. Myosin head pivoting, 5. Cross bridge detachment, 6. Myosin reactivation. What percent of the ATP demands of a resting muscle cell are met through aerobic metabolism? A) 25 B) 50 C) 70 D) 90 E) 100

          69. Put the following events of excitation-contraction coupling in the order in which they occur: 1. Neural control, 2. Excitation, 3. Release of calcium ions, 4. Contraction cycle begins, 5. Sarcomere shortening, 6. Generation of muscle tension.

70. Put the following events of the contraction cycle in the order in which they occur: 1. Active site exposure, 2. Calcium ions bind troponin, 3. Cross bridge formation, 4. Myosin head pivoting, 5. Cross bridge detachment, 6. Myosin reactivation.

What percent of the ATP demands of a resting muscle cell are met through aerobic metabolism? A) 25 B) 50 C) 70 D) 90 E) 100

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