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 |
 87%
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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In the given diagram of the human skull, the bones represented by the letters A, B, and C are respectively:

                

1. Sphenoid, Ethmoid and Lacrimal

2. Ethmoid, Sphenoid and Lacrimal

3. Sphenoid, Lacrimal and Ethmoid

4. Ethmoid, Lacrimal and Sphenoid

Subtopic:  Axial Skeleton: I | Axial Skeleton |
 76%
From NCERT
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Match each item in Column I with one in Column II and choose your answer from the codes given below:
       Type of joint            Example
       A. Hinge            a. First carpo-metacarpal
       B. Pivot              b. Between the carpals
       C. Gliding           c. Atlanto-axial
       D. Saddle           d. Knee joint

            A.    B.    C.     D.
   

1.     d     c      b      a
   

2.     c     d      b      a
   

3.     c     b      d      a
   

4.     d     b      a      c

Subtopic:  Synovial Joint |
 92%
From NCERT
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During skeletal muscle contraction, increase in calcium levels leads to binding of calcium to a subunit of _______ on ______ filaments and thereby removes the masking of active sites for ______.

1. Troponin, Tropomysin, Myosin

2. Calmodulin, Actin, Myosin

3. Troponin, Actin, Myosin

4. Calmodulin, Actin, Myosin

Subtopic:  Skeletal Muscle: Myofilaments |
 68%
From NCERT
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