During resting stage the binding site of actin for myosin remains masked by
1. Troponin                2. Gactin
3. Tropomyosin          4. Meromyosin

Subtopic:  Skeletal Muscle: Myofilaments |
 84%
From NCERT
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Calcium is important in skeletal muscle contraction because it:
1. Detaches the myosin head from the actin filament.
2. Activates the myosin ATPase by binding to it.
3. Binds to troponin to remove the masking of active sites on actin for myosin.
4. Prevents the formation of bonds between the myosin cross bridges and the actin filament.

Subtopic:  Excitation Contraction Coupling I | Muscle Contraction: Other Considerations |
 84%
From NCERT
NEET - 2018
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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 |
 85%
From NCERT
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Myasthenia gravis is an autoimmune disease in which antibodies are formed against:
1. Myelin sheath
2. Articular cartilage
3. Neuro-muscular junctions
4. Thyroid follicle

Subtopic:  Human Skeleton: Introduction, Function, Parts |
 88%
From NCERT
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The first carpo-metacarpal joint is a/an:
1. Saddle joint             2. Ellipsoidal joint
3. Pivot joint               4. Fibrous joint

Subtopic:  Synovial Joint |
 86%
From NCERT
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The central part of the thick myofilaments, not overlapped by thin filaments, is called the:
1. Z line         2. M line
3. I band        4. H zone

Subtopic:  Skeletal Muscle: Sarcomere |
 86%
From NCERT
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Vertebrochondral ribs attach to the seventh rib with the help of:

1. Elastic cartilage

2. Hyaline cartilage

3. Fibrous cartilage

4. White fibrous tissue

Subtopic:  Sternum & Ribs |
 93%
From NCERT
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Myosin head cleaves ATP for:

1. Formation of cross bridges

2. Breaking of cross bridges

3. Both 1 and 2

4. Neither 1 nor 2

Subtopic:  Sliding Filament Theory |
From NCERT
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Vitamin D deficiency in an adult causes the condition known as _____.

1.rickets

2. osteoporosis

3. osteomalacia

4. giantism

Subtopic:  Muscle Contraction: Other Considerations |
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The number of correct statements amongst the given statements is:

I. Cardiac muscles are striated and involuntary.

II. Myosin head is an active ATPase enzyme.

III. The neurotransmitter released at the neuromuscular junction is acetylcholine.

IV. White muscle fibers depend on anaerobic process for energy.

V. Functional unit of muscle contraction is the sarcomere.

  1.  2       

  2.  3

  3.  4       

  4.  5

Subtopic:  Skeletal Muscle: Sarcomere |
 82%
From NCERT
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