Question 11 of 25 Which is a reason to use digital signals instead of analog signals to transmit
information?
A. The waves used to transmit analog signals require more energy
than the waves used to transmit digital signals.
B. Noise changes the quality of analog signals but does not affect
the reliability of digital signals.
C. The waves used to transmit analog signals are more dangerous
than the waves used to transmit digital signals.
D. Noise decreases the loudness of analog signals but does not
affect the loudness of digital signals.

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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thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.