Select the correct statement regarding the specific disorder of muscular or skeletal system.
Correct answer: B. Osteoporosis - Decrease in bone mass and higher chances of fractures with advancing age
- A. Muscular dystrophy - Age related shortening of muscles
- B. 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
Explanation
Muscular dystrophy is characterised by progressive skeletal muscle weakness, defects in muscle proteins and the death of muscle cells and tissue. It is an inborn disorder.B) 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.C) 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.D) Osteoporosis is when estrogen level falls in elderly women after menopause. It results in weak ,porus and thin bones.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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