Discussion
If an electric current is passed through a nerve, the human :
Answer: C
The answer is Is excited.
A nerve fibre is excitable tissue. An electric current applied to it depolarises the membrane, and once the threshold is crossed an action potential, a nerve impulse, is set off, just as a natural stimulus would set it off. Electric stimulation is in fact the standard way of exciting nerves in physiology experiments.
The other options name particular behaviours (laughing, weeping) or the opposite effect (loss of sensation), none of which is the general response of nerve tissue to a current.
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