As an action potential travels down the axon, there is a change in polarity across the membrane. The Na + and K + gated ion channels open and close as the membrane reaches the threshold potential, in response to a signal from another neuron.everal types of cells support an action potential, such as plant cells, muscle cells, and the specialized cells of the heart (in which occurs the cardiac action potential). However, the main excitable cell is the neuron, which also has the simplest mechanism for the action potential.
Dream bears are sometimes associated with possessive mothers, since mother bears have a powerful instinct to protect their cubs. If a mother bear and her cubs appear in a dream, this may indicate a desire to have children or to protect your children from danger. Bears in dreams are also associated with victory over competitors or rivals in love. They are often about power, an imbalance of power, or the use of power. The dream bear is linked to concepts like grumpiness, over-protectiveness, and hibernation or retreat.
September 10, 2009 at 11:02 AM. I think the spirit bear symbolize's wisdom, and boldness. I think the spirit bear symbolize's those two things, because when I first read the book that is what I thought it symbolized and it still does symbolize that to me. think the spirit bear symbolizes a second chance for Cole. I think Cole will make a recovery from the attack, and then he will be a new person. I think the at.oow symbolizes bravery and courage, and it might help Cole.