12) Which of the following events restores the membrane potential from the peak

Question

12) Which of the following events restores the membrane potential from the peak of the action potential back to the resting level? A) Sodium ions move into the cell. B) Potassium ions move out of the cell. C) Potassium ions move into the cell. D) Chloride ions move into the cell. E) A and C are correct. 13) Saltatory conduction is rapid because A) myelinated axons are larger in diameter. B) myelinated axons have more leakage through the membrane. C) myelinated axons do not have to depolarize along the entire axon membrane. D) myelinated cells have more ion channels per unit area than do non-myelinated cells. E) myelinated cells have a lower threshold of activation. 14) Repeated administration of a constant drug dose typically produces , which is

Explanation / Answer

1. Answer: C) potassium ions move out of the cell

As the potassium ions move out of the axon, they would move the membrane potential back towards the resting potential levels.

2. Answer: C) myelinated axons do not have to depolarise along the entire axon membrane

Saltatory conduction is rapid because under the myelin sheath, cable properties would carry the signal. The membrane potential would not have to depolarise at subsequent patches of the membrane.

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