A person who has allergies has a compromised immune system because the body's immune system attacks its healthy cells.
overreacts to an antigen.
• steals nutrients from healthy cells.
O responds to mutagens.

overreacts to an antigen

Explanation:

Allergies to substances are as a result of immunological dysfunction.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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