The globular head of the myosin filament has active site/s for binding to:

 I. ATP

II. binding site for actin filament 

III. Calcium

1. Only I

2. Only I and II

3. Only II and III

4. I, II and III

Subtopic:  Skeletal Muscle: Myofilaments |
 79%
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Immediately after an action potential has peaked, which cellular gates open?

1. Sodium
2. Chloride
3. Calcium
4. Potassium

Subtopic:  Action Potential |
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The useful purpose served by lactate fermentation is:
1. Make lactose available for gluconeogenesis
2. Production of additional ATP in anaerobic conditions
3. Regeneration of NAD+
4. Increased availability of oxygen for the skeletal muscle

Subtopic:  Muscle Contraction: Other Considerations |
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Scapula is a large triangular flat bone situated in the dorsal part of the thorax between:

1. the second and fifth ribs

2. the second and seventh ribs

3. the third and sixth ribs

4. the third and eighth ribs

Subtopic:  Appendicular Skeleton: Girdle |
 88%
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Consider the following statements:

I. Myasthenia gravis is an autoimmune disorder affecting neuromuscular junction

II. Muscular dystrophy is a progressive degeneration of skeletal muscles mostly due to genetic disorder

III. Tetany is rapid spasms in muscle due to high Ca"" in body fluid.

Which of the above statements are true?

1. I and II only

2. I and III only

3. II and III only

4. I, II and III

Subtopic:  Disorders of Muscular and Skeletal System |
 79%
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Match each item in Column I with one item in Column II and choose your answer from the codes given below:

Column I

Column II

I.

Influx of sodium

1.

Original establishment of RMP

II.

Efflux of potassium

2.

Repolarization

III.

Na+/K+ pump

3.

Depolarization

IV.

Ca++

4.

Plateau in cardiac muscles


Codes :

I

II

III

IV

1.

3

2

4

1

2.

2

1

4

3

3.

2

1

3

4

4.

3

2

1

4

Subtopic:  Action Potential |
 80%
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What masks the active sites for myosin head present on the actin myofilaments?
1. Light meromyosin
2. Heavy meromyosin
3. G – actin
4. Troponin

Subtopic:  Sliding Filament Theory |
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A motor unit consists of:
1. A motor neuron and all the muscle fibers innervated by it
2. All the motor neurons innervating one muscle fiber
3. All the muscle fibers in a fasciculus
4. All the muscle fibers in a skeletal muscle

Subtopic:  Excitation Contraction Coupling I |
 80%
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The muscle can directly use which of the following as a source of energy?
1. Creatine phosphate
2. Glucose
3. ATP
4. Fatty acids

Subtopic:  Energy for Muscle Contraction |
 85%
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With respect to the red muscle fiber, the white muscle fiber has higher:
1. Density of capillary network
2. Number of mitochondria
3. Amount of sarcoplasmic reticulum
4. Glycogen reserve

Subtopic:  Muscle Contraction: Other Considerations |
 87%
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