Which of the following has ATPase activity?

1. Actin                            2. Tropomyosin

3. Head of myosin             4. Troponin

Subtopic:  Skeletal Muscle: Myofilaments |
 76%
From NCERT
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The ATPase activity of the myosin head is dependent on:

1. Magnesium ions

2. Manganese ions

3. Calcium ions

4. Ferric ions

Subtopic:  Excitation Contraction Coupling I | Excitation Contraction Coupling II |
 84%
From NCERT
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Skeletal muscle bundles [fascicles] are held together by a common connective tissue layer called:

1. Perimysium

2. Endomysium

3. Fascia

4. Aponeurosis

Subtopic:  Skeletal Muscle: Basic Anatomy |
 81%
From NCERT
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The neurotransmitter released at the neuromuscular junction is:

1. Adrenaline

2. Nor-adrenaline

3. Dopamine

4. Acetylcholine

Subtopic:  Excitation Contraction Coupling I |
 88%
From NCERT
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During muscle contraction, the length of all the following gets reduced except:

1. H-Zone

2. A-Band

3. I-Band

4. Sacromere

Subtopic:  Skeletal Muscle: Sarcomere |
 71%
From NCERT
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What is true about the white muscle fibers?

1. Myoglobin content is high

2. They have a large number of mitochondria

3. They depend on anaerobic process for energy

4. They are adapted for slow sustained activities

Subtopic:  Muscle Contraction: Other Considerations |
 73%
From NCERT
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The human ribs are termed as bicephalic because:

1. They have two articulations surfaces on their ventral end.

2. They have two articulations surfaces on their dorsal end.

3.  They have two articulations surfaces on their ventral end and two on the dorsal end.

4. They have two articulations surfaces on their ventral end and one on the dorsal end.

Subtopic:  Sternum & Ribs |
 60%
From NCERT
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The clavicle is articulated with the:

1. Xiphoid process of the sternum

2. Acromion of the scapula

3. Glenoid cavity of the scapula

4. Head of the humerus

Subtopic:  Appendicular Skeleton: Girdle |
 64%
From NCERT
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Hypocalcemia may lead to:-

1. Kidney stones
2. Cholelithiasis
3. Stronger muscle contractions
4. Tetany

Subtopic:  Muscle Contraction: Other Considerations |
 67%
From NCERT
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Identify the incorrectly matched pair:

      Joint                                             Type

1. Proximal radio-ulnar joint                 Pivot

2. Joint between the carpals               Gliding

3. Joint between metacarpal of           Saddle
    thumb and phalange

4. Humero-ulnar joint                         Hinge

Subtopic:  Synovial Joint |
From NCERT
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