Nerve fibres continue to conduct impulses when A. Extracellular sodiu

1.	Nerve fibres continue to conduct impulses when A. Extracellular sodium is replaced by potassium. B. Extracellular sodium is replaced by a non-diffusible cation. C. Temperature is lowered from 37 to 30oC. D. Temperature is lowered to below 0oC provided freezing does not occur. E. The sodium-potassium pump is inactivated.
Answer» A. False This would depolarize the fibres completely. B. False Influx of cations is essential for depolarization. C. True However, conduction is slowed. D. False Nerve fibres stop conducting before tissue freezing occurs. E. True They continue to conduct until the electro chemical gradients created by the pump decline.

Nerve fibres continue to conduct impulses when A. Extracellular sodium is replaced by potassium. B. Extracellular sodium is replaced by a non-diffusible cation. C. Temperature is lowered from 37 to 30oC. D. Temperature is lowered to below 0oC provided freezing does not occur. E. The sodium-potassium pump is inactivated.

Answer»

A. False This would depolarize the fibres completely.

B. False Influx of cations is essential for depolarization.

C. True However, conduction is slowed.

D. False Nerve fibres stop conducting before tissue freezing occurs.

E. True They continue to conduct until the electro chemical gradients created by the pump decline.

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