Using a micropipette,a neuroscientist injects an axon with enough Na⁺ ions to move the membrane potential +25mV (from resting).What happens next?
A)The membrane potential will be at the Na⁺ equilibrium potential.
B)Voltage-gated Na⁺ will be triggered to open.
C)The neuron membrane will be hyperpolarized.
D)Na⁺ channels will all be inactivated.
E)None of the answer choices are correct.

Question

Using a micropipette,a neuroscientist injects an axon with enough Na⁺ ions to move the membrane potential +25mV (from resting).What happens next?
A)The membrane potential will be at the Na⁺ equilibrium potential.
B)Voltage-gated Na⁺ will be triggered to open.
C)The neuron membrane will be hyperpolarized.
D)Na⁺ channels will all be inactivated.
E)None of the answer choices are correct.

Quizplus · Accepted Answer

Injecting enough Na⁺ ions into an axon to move the membrane potential from resting to +25mV will reach the threshold potential required to trigger voltage-gated Na⁺ channels to open. This will result in an action potential being generated and propagated along the axon.

Using a Micropipette,a Neuroscientist Injects an Axon with Enough Na⁺