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

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 17. Locomotion and movement1 Mark
MCQ
Select the correct statement with respect to disorders of muscles in humans.
  • ✓
    Failure of neuromuscular transmission in myasthenia gravis can prevent normal swallowing.
  • B
    Accumulation of urea and creatine in the joints causes their inflammation.
  • C
    An overdose of vitamin $D$ causes osteoporosis.
  • D
    Rapid contractions of skeletal muscles cause muscle dystrophy.
✓

Answer

Correct option: A.
Failure of neuromuscular transmission in myasthenia gravis can prevent normal swallowing.
a
(a) : Myasthenia gravis is an autoimmune disorder in which autoantibodies bind to cholinergic receptors on muscle cells and impairs the ability of the neurotransmitter acetylcholine to induce muscular contraction. This leads to fatigue, weakening and paralysis of skeletal muscles ofmouth and throat which may prevent normal swallowing. Gouty arthritis is caused either due to excessive formation of uric acid or inability to excrete it. It gets deposited in synovial joints and causes inflammation. Osteoporosis is a disease in which bone loses minerals and fibres from its matrix. Major causative factors of osteoporosis are imbalances of hormones like calcitonin of thyroid, parathormone of parathyroids, sex hormones and deficiencies of calcium and vitamin $D$. Muscular dystrophy is inborn abnormality of muscles associated with dysfunction and ultimately with deterioration.

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