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.
In addition to this, bear is a symbol of wisdom for the Lakota Sioux, spirit keeper for the Chippewa and introspection and strength. The bear has been associated with ferocity, diplomacy and healing powers. The Haida associate bear to an elder kinsman and when killed it is believed to be a high ranking guest.Many believe that as a wise creature, it gains wisdom through its winter incubation and it bears a symbol of maternal protection.It is still seen as a great warrior and the male is associated with King Arthur, it symbolizes great power under control, with claws significantly displayed on crests or on shields.any believe that as a wise creature, it gains wisdom through its winter incubation and it bears a symbol of maternal protection. It is still seen as a great warrior and the male is associated with King Arthur, it symbolizes great power under control, with claws significantly displayed on crests or on shields.