- 1(current)
Q. No.Even when the blood supply is inadequate, the muscle is able to sustain contraction due to:
| 1. | the presence of hemoglobin | 2. | glycogen storage |
| 3. | myoglobin | 4. | citric acid cycle |
Identify the correct statement regarding the use of ATP in muscle contraction:
1. ATP cannot be directly used for muscle contraction.
2. ATP is not required for muscle relaxation.
3. When ATP is hydrolyzed, the conformation of myosin is changed.
4. Once the cross-bridge is formed, the hydrolysis of ATP initiates the power stroke.
The phosphogen that helps the regeneration of ATP from ADP during muscle contraction in vertebrates is
| 1. | ADP | 2. | Inosital phosphate |
| 3. | Arginine phosphate | 4. | Creatine phosphate |
The direct source of energy for muscle contraction is:
1. ATP
2. Creatine phosphokinase
3. Oxidative phosphorylation of glucose
4. Reduction of pyruvate to lactate
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Identify the incorrect statement:
1. All motor neurons innervating a single muscle fiber constitute a motor unit.
2. Cross bridges occur when myosin heads combine with the binding sites on actin.
3. The neurotransmitter that stimulates skeletal muscle is acetylcholine.
4. The area of the sarcomere that contains only thin and elastic filaments is the I band.
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- 1(current)
Q. No.
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