medical_animation on Instagram: "Nicotinic acetylcholine receptors (nAChRs) play a crucial role in neuromuscular signaling at the neuromuscular junction (NMJ), mediating fast synaptic transmission between motor neurons and muscle fibers. In myasthenia gravis, autoantibodies target these receptors on the muscle fiber sarcolemma, reducing their availability and impairing signal transmission, leading to muscle weakness and fatigue. The cycle of acetylcholine (ACh) release remains intact, but the di