Go through the following diagram describing muscle contraction:

Now identify A to E:
(1) A - Cross bridge, B - Cross bridge formation, C - Breaking of cross bridge, D - Sliding (rotation), E - ATP

(2) A - Cross bridge, B - Cross bridge formation, C - Sliding / rotation, D - Breaking of cross bridge, E - ATP

(3) A - Cross bridge, B - Breaking of Cross bridge, C - sliding / rotation, D - Cross bridge formation, E - AMP

(4) A - Cross bridge, B - Cross bridge formation, C - Sliding / rotation, D - ADP, E - Breaking of cross bridge

Subtopic:  Sliding Filament Theory |
 72%
From NCERT
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The muscle band that remains unchanged during muscle contraction and relaxation of the skeletal muscle is:

(1) I                     

(2) A                    

(3) H                    

(4) Z-line

Subtopic:  Skeletal Muscle: Sarcomere |
 89%
From NCERT
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The compound or pigment acting as an oxygen store in skeletal muscles is:

(1) Myoglobin                                    

(2) Haemoglobin

(3) Myokinase or ATP                         

(4) Cytochrome

Subtopic:  Muscle Contraction: Other Considerations |
 88%
From NCERT
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I. Number of mitochondria less.
II. Number of mitochondria more
III. Sarcoplasmic reticulum is abundant
IV. Myoglobin content high
V. Sarcoplasmic reticulum moderate
VI. Aerobic muscles
VII. Depend on anaerobic respiration for energy
VIII. Less myoglobin content
A. Red muscles B. White muscles
Identify above (I to VIII) traits as characteristic of A and B types of muscles:
(1) A - I, III, VII, VIII; B - II, IV, V, VI

(2) A - II, IV, V, VI; B - I, III, VII, VIII

(3) A - I, III, IV, VII; B - II, V, VI, VIII

(4) A - II, V, VI, VIII; B - I, III, IV, VII

Subtopic:  Muscle Contraction: Other Considerations |
 85%
From NCERT
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How many bones make up the human skeleton?

(1) 948                

(2) 96                            

(3) 796                

(4) 206

Subtopic:  Human Skeleton: Introduction, Function, Parts |
 98%
From NCERT
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Number of bones in human axial skeleton is:

(1) 80                            

(2) 106                

(3) 206                

(4) None of these

Subtopic:  Number of Bone in Axial Skeleton |
 90%
From NCERT
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Match Column-I with Column-II:
          Column-I                                              Column-II (Number of bones)
   A. Cranium / Brainbox                                            I. 22
   B. Skull (Cranial and facial bones)                           II. 8
   C. Face                                                                 III. 14
   D. Hind limb                                                          IV. 12 pairs
   E. Ribs                                                                  V. 30
(1) A - I, B - II, C - III, D - V, E - IV             

(2) A - II, B - I, C - III, D - V, E - IV

(3) A - I, B - II, C - III, D - IV, E - V             

(4) A - V, B - IV, C - III, D - II, A - I

Subtopic:  Number of Bone in Axial Skeleton | Number of Bone in Appendicular Skeleton |
 83%
From NCERT
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Human skull is:

(1) Dicondylic       

(2) Monocondylic  

(3) Procoelous      

(4) Hetercoelous

Subtopic:  Axial Skeleton: I | Axial Skeleton |
 94%
From NCERT
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Which of the following statements about human vertebral column is false:

(1) Vertebral column consists of 26 vertebrae

(2) It is ventrally placed

(3) It extends from the base of skull and constitutes the main framework of the trunk

(4) Neural canal in vertebra is the passage for spinal cord

Subtopic:  Sternum & Ribs |
 82%
From NCERT
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Human adult vertebral formula is:

(1) C4 T8 L4 S8 C8                               

(2) C7 T8 L5 S6 C7

(3) C7 T112 L2 S1 C2                            

(4) C7 T12 L5 S1 C1

Subtopic:  Vertebral column |
 90%
From NCERT
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