In the context of the neural impulse, the outer membrane of a neuron is semipermeable, which indicates that only sodium ions can cross the membrane the fluid outside the membrane has no electrical charge fluids and ions can sometimes flow into and out of it depolarization of the membranes cannot occur

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

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he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.