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.
The spiritual meaning and significance of Bear Symbolism... Bear is a great teacher and a powerful symbol and totem, it is a great honor and responsibility to have Bear symbol walking beside you ~ teaching you humility and how to access your greatest strengths.