An organism exposed to tetrodotoxin, which blocks the passage of sodium ions through sodium channels, would most likely experience muscle weakness or paralysis. Sodium ions play a crucial role in generating and propagating electrical signals in nerve cells and muscle cells. By blocking sodium channels, tetrodotoxin disrupts the normal transmission of nerve signals, leading to a loss of muscle control and function. This can result in symptoms such as muscle weakness, paralysis, and difficulty moving.
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~~~Harsha~~~