Class 11 Exam  >  Class 11 Questions  >  Assertion (A): Myasthenia gravis is primarily... Start Learning for Free
Assertion (A): Myasthenia gravis is primarily characterized by the rapid degeneration of skeletal muscle fibers.
Reason (R): Myasthenia gravis affects the neuromuscular junction, leading to fatigue and weakness in skeletal muscles.
  • a)
     
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • b)
    If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • c)
     
    If Assertion is true but Reason is false
  • d)
     
    If both Assertion and Reason are false
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Assertion (A): Myasthenia gravis is primarily characterized by the rap...
  • The Assertion (A) is false because myasthenia gravis does not primarily involve the degeneration of muscle fibers; rather, it is an autoimmune disorder affecting the communication at the neuromuscular junction.
  • The Reason (R) is true as it correctly describes the mechanism of myasthenia gravis, which indeed leads to fatigue and weakness in skeletal muscles due to the disruption at the neuromuscular junction.
  • Therefore, since the Assertion is false and the Reason is true, the correct answer is Option 4: If both Assertion and Reason are false.
View all questions of this test
Most Upvoted Answer
Assertion (A): Myasthenia gravis is primarily characterized by the rap...
Understanding Myasthenia Gravis
Myasthenia gravis is a chronic autoimmune disorder that primarily affects the communication between nerves and muscles.
Assertion Analysis
- The assertion states that myasthenia gravis is characterized by the rapid degeneration of skeletal muscle fibers.
- This is incorrect. Myasthenia gravis does not involve the degeneration of muscle fibers but rather a disruption in the neuromuscular junction.
Reason Analysis
- The reason explains that myasthenia gravis affects the neuromuscular junction, leading to fatigue and weakness in skeletal muscles.
- This statement is true. In myasthenia gravis, antibodies block or destroy the receptors for acetylcholine, a neurotransmitter essential for muscle contraction, resulting in muscle weakness and fatigue.
Conclusion
- Since the assertion is false and the reason is true, the correct answer is option 'D' — both Assertion and Reason are false.
- Myasthenia gravis does not cause muscle degeneration; instead, it leads to impaired signaling at the neuromuscular junction, causing symptoms of weakness.
Key Takeaways
- Assertion (A): False (myasthenia gravis does not cause muscle fiber degeneration)
- Reason (R): True (it affects neuromuscular junctions, causing muscle fatigue)
- Correct Option: D (both Assertion and Reason are false)
Explore Courses for Class 11 exam

Top Courses for Class 11

Assertion (A): Myasthenia gravis is primarily characterized by the rapid degeneration of skeletal muscle fibers.Reason (R): Myasthenia gravis affects the neuromuscular junction, leading to fatigue and weakness in skeletal muscles.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'D'. Can you explain this answer?
Question Description
Assertion (A): Myasthenia gravis is primarily characterized by the rapid degeneration of skeletal muscle fibers.Reason (R): Myasthenia gravis affects the neuromuscular junction, leading to fatigue and weakness in skeletal muscles.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'D'. Can you explain this answer? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Assertion (A): Myasthenia gravis is primarily characterized by the rapid degeneration of skeletal muscle fibers.Reason (R): Myasthenia gravis affects the neuromuscular junction, leading to fatigue and weakness in skeletal muscles.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A): Myasthenia gravis is primarily characterized by the rapid degeneration of skeletal muscle fibers.Reason (R): Myasthenia gravis affects the neuromuscular junction, leading to fatigue and weakness in skeletal muscles.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'D'. Can you explain this answer?.
Solutions for Assertion (A): Myasthenia gravis is primarily characterized by the rapid degeneration of skeletal muscle fibers.Reason (R): Myasthenia gravis affects the neuromuscular junction, leading to fatigue and weakness in skeletal muscles.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 11. Download more important topics, notes, lectures and mock test series for Class 11 Exam by signing up for free.
Here you can find the meaning of Assertion (A): Myasthenia gravis is primarily characterized by the rapid degeneration of skeletal muscle fibers.Reason (R): Myasthenia gravis affects the neuromuscular junction, leading to fatigue and weakness in skeletal muscles.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Assertion (A): Myasthenia gravis is primarily characterized by the rapid degeneration of skeletal muscle fibers.Reason (R): Myasthenia gravis affects the neuromuscular junction, leading to fatigue and weakness in skeletal muscles.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Assertion (A): Myasthenia gravis is primarily characterized by the rapid degeneration of skeletal muscle fibers.Reason (R): Myasthenia gravis affects the neuromuscular junction, leading to fatigue and weakness in skeletal muscles.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Assertion (A): Myasthenia gravis is primarily characterized by the rapid degeneration of skeletal muscle fibers.Reason (R): Myasthenia gravis affects the neuromuscular junction, leading to fatigue and weakness in skeletal muscles.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Assertion (A): Myasthenia gravis is primarily characterized by the rapid degeneration of skeletal muscle fibers.Reason (R): Myasthenia gravis affects the neuromuscular junction, leading to fatigue and weakness in skeletal muscles.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice Class 11 tests.
Explore Courses for Class 11 exam

Top Courses for Class 11

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev