Select the BEST word for each sentence. Be sure to read the sentence carefully. 1. Organs are made of a group of
• working together to carry out a
job.
2. Cell parts work together to carry out all the life functions of
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3. Biological macromolecules are made of
.
4. Cell parts are made of
-
5. The small intestine, the heart, and the lungs are examples of
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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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