1) Which of the following occurs in skeletal muscle fibers, directly after all o
ID: 3473079 • Letter: 1
Question
1) Which of the following occurs in skeletal muscle fibers, directly after all of the oxygen in myoglobein is depleted:
a. Muscle fibers can only get ATP through anaerobic fermentation
b. Muscle fibers can temporarily convert ADP to ATP using creatine phosphate, part of the phosphagen system.
c. Muscle fibers immediatlely switch over to aerobic respirating supported by cardiopulmonary function.
d. Muscle fibers must break down lactic acid, immediately gaining ATP from the energy stored in lactic acid.
e. Switch from glucose to ketones as a source of energy.
2) In skeletal muscle, a contraction cycle cannot begin until:
a. Calcium binds to myoslin, allowing for crossbridge formation.
b. Calcium binds to tropomyosin, allowing for corssbridge formation.
c. Calcium bind to troponin, allowing for crossbring formation.
d. Sodium binds to troponin, allowing for corssbridge formation.
e. Sodium bind to tropomyosin, allowing for crossbridge formation.
3.) The triceps brachii has three heads, two of which have origins on the posterior aspect of the humerus, and the third on the scapula. The insertion for all three heads is on the olecranon of the ulna. Based on this information, what is the action of this muscle?
a. Elbow extension
b. Elbow flexion
c. Shoulder circumduction
d. Shoulder flexion
e. Wrist extension.
Explanation / Answer
1) The process of skeletal muscle contraction requires ATP molecules. Under normal conditions, the energy for muscular contraction is provided by breakdown of glucose and free fatty acids under aerobic conditions. The oxygen required for the process is provided by myoglobin. When the oxygen supply is depleted, the muscles can temporarily convert ADP to ATP using creatine phosphate which forms a part of the phosphagen system. (option b).
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