Make a chart with e on the x-axis (1 – 10 gpa) and yield strength on the y-axis (10 – 100 mpa). select polypropylene (pp) and its various grades by applying a ‘tree’ stage selecting polymers – thermoplastics – pp (folder). label at least 10 records on the chart (from the bottom, middle, and top). insert the chart below, and then explain the trends you see. discuss the effects of 1) homopolymer versus copolymer, 2) ‘neat’ homopolymer versus additives, and 3) additives of particles versus fiber

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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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