Question: The altitude of a location is its vertical distance above sea level. How does altitude
affect phase changes?
1. Form a hypothesis: As altitude increases, the air pressure decreases. How do you think the lower
pressure will affect the following? (Circle your answers.)
A
Freezing point:
Increase
Stay the same
Decrease
B. Melting point
Increase
Stay the same
Decrease
C. Boiling point
Increase
Stay the same
Decrease

d. sodium chloride ions.

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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