In old age, stiffness of joints is due to the 

(1) hardening of bones

(2) inefficiency of muscles

(3) decrease in synovial fluid

(4) enlargement of bones

Subtopic:  Synovial Joint |
 85%
AIIMS - 2015
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Oxygen content reduction makes the glycolyse (glycogenesis) intensity increased due to

(1) increase of ADP concentration in cell

(2) increase of NAD+ concentration in cell

(3) increase of ATP concentration in cell

(4) increase of concentration of peroxides and free radicals 

Subtopic:  Energy for Muscle Contraction |
AIIMS - 2010
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Pick out the correct match

(1) Sternum       - 14

(2) Pelvis           - 3

(3) Ribs             - 20

(4) Face            - 5

Subtopic:  Appendicular Skeleton: Girdle |
 74%
From NCERT
AIIMS - 2009
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Match Column-I with Column-II:

Column-I Column-II
A.   Structural and functional unit of a myofibril
B.   Protein of thin filament
C.   Protein of thick filament
D.   The central part of thick filament not overlapped by thin filament
I. H-zone
II. Myosin
III. Sarcomere
IV. Actin

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

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

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

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

Subtopic:  Skeletal Muscle: Sarcomere |
 93%
From NCERT
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Sarcomere is the area between:

(1) 2 H-zones       

(2) 2 Z-lines                  

(3) 2 M-lines                  

(4) 2 A-bands

Subtopic:  Skeletal Muscle: Sarcomere |
 88%
From NCERT
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Light bands (thin filaments) contain actin and are called:

(1) A-bands or Isotropic band            

(2) A-bands or Anisotropic bands

(3) I-bands or Isotropic bands           

(4) I-bands or Anisotropic bands

Subtopic:  Skeletal Muscle: Sarcomere |
 84%
From NCERT
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Dark bands (thick filaments) contain myosin and are called:

(1) A-bands or Isotropic band            

(2) A-bands or Anisotropic bands

(3) I-bands or Isotropic bands           

(4) I-bands or Anisotropic bands

Subtopic:  Skeletal Muscle: Sarcomere |
 92%
From NCERT
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Choose the letter from the figure that most appropriately corresponds to the structure:

I.A-band       II. I-band           III.    Sarcomere         IV.     H-zone

V.Myosin       VI.Actin, Troponin, Tropomyosin             VII.   Z –line

(1) I - E, II - D, III - F, IV - G, V - B, VI- C, VII - A

(2) I - E, II - D, III - C, IV - G, V - B, VI - A, VII - F

(3) I - E, II - D, III - F, IV - G, V - C, VI - A, VII - B

(4) I - E, II - D, III - F, IV - A, V - B, VI - C, VII - G

Subtopic:  Skeletal Muscle: Sarcomere |
 82%
From NCERT
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The functions of tropomyosin in skeletal muscle include:
(1) Sliding on actin to produce shortening

(2) Release Ca+2 after initiation of contraction

(3) Acting as "relaxing protein" at rest by covering up the sites where myosin binds to actin

(4) Generates ATP

Subtopic:  Skeletal Muscle: Myofilaments |
 65%
From NCERT
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Ca+2 bind ________ in the skeletal muscles and leads to exposure of the binding site for ________ on the filament _______:

(1) Troponin, myosin, actin                

(2) Troponin, actin, relaxin

(3) Actin, myosin, troponin                

(4) Tropomysin, myosin, actin

Subtopic:  Excitation Contraction Coupling I |
 81%
From NCERT
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