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🔬 Biology  ·  Neural Control and Coordination  ·  NEET

Myasthenia gravis is caused by:

Answer: Autoimmune attack on acetylcholine receptors at neuromuscular junction.

  • A Dopamine deficiency in the substantia nigra region of the midbrain
  • B Autoimmune attack on acetylcholine receptors at neuromuscular junction
  • C Progressive loss of the myelin sheath surrounding central nervous system axons
  • D Excess GABA accumulation occurring at inhibitory central nervous synapses

Correct answer: B. Autoimmune attack on acetylcholine receptors at neuromuscular junction

Explanation: Myasthenia gravis: autoimmune disease. Antibodies block or destroy acetylcholine receptors at NMJ. Causes muscle weakness, especially with repeated use.

Labeled diagram of a neuron showing dendrites, cell body (soma) with nucleus, axon, myelin sheath, Nodes of Ranvier, and axon terminals

Structure of a neuron. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.

Concept context

Brain, spinal cord, neurons, reflex arcs, and sense organs.

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