Briefly describe the cellular
events responsible for the refractory period (hint: discuss the mechanism of
repolarization):
<span>The buildup of potassium
during repolarization into hyperpolarization, that makes it more difficult for
the stimulus to reach its threshold, is the events responsible for the
refractory period. It is measured for the earthworm as the largest interval
wherein the action potential (second spike) cannot be generated.</span>
<span>The answer to 10 is A as liquids expand with an increase in temperature. 12. Not able to answer. The answer to 17 is A as a the two different metals expand and contract at different rates when heated and cooled.</span>
