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STD 11 - 17. Locomotion and movement — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 17. Locomotion and movement1 Mark
MCQ
Select the correct statement regarding the specific disorder of muscular or skeletal system.
  • A
    Muscular dystrophy -Age related shortening of muscles
  • ✓
    Osteoporosis -Decrease in bone mass and higher chances of fractures with advancing age
  • C
    Myasthenia gravis -Autoimmune disorder which inhibits sliding of myosin filaments
  • D
    Gout -Inflammation of joints due to extra deposition of calcium
✓

Answer

Correct option: B.
Osteoporosis -Decrease in bone mass and higher chances of fractures with advancing age
b
(b) : Muscular dystrophy is characterised by progressive skeletal muscle weakness, defects in muscle proteins and the death of muscle cells and tissue.Myasthenia gravis is an auto­immune neuromuscular disease in which muscle becomes weak, which is caused by circulating antibodies that block acetylcholine receptors at the postsynaptic neuromuscular junction inhibiting the excitatory effects of the acetylcholine. Gout is inflammation of joints which is caused by elevated levels of uric acid in the blood which crystallises and the crystals are deposited in joints, tendons and surrounding tissues.

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