Alma is walking in a park. Suddenly, a wild dog charges toward her. Alma is frightened. The starts to
respond by increasing her heart rate and dilating her pupils. After running for a few minutes, Alma realizes that the dog has fallen far
behind. At this point, her
starts working to relax her body by slowing down her heart rate and
constricting her pupils.

the answer is b. 0; 4

the answer is yes, they are born/created, then they grow to their limit then produce offspring, then die.

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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