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.
If you dream of a heron, it can mean that you soon will meet a stable or rich partner. It can also symbolize success and self-reliance. To see a bird's nest in your dream signifies comfort, safety, and protection. The dream may also symbolize new opportunities.To see an owl in a dream is symbolic of wisdom and virtue. To dream of a parakeet means that an idea lacks originality and energy and may fail.It can also mean that someone else is taking credit for your ideas. If you dream of a pelican, you might be pregnant. The bird is symbolic of motherhood, birth, and nurturing.If you dream of a penguin, it means that whatever problem is bothering you is not as serious as you think. To dream of a phoenix can mean that your past may come back to haunt you. To dream of a quail is an omen of good fortune.To shoot, kill, cook or eat a quail means that you will become very rich soon. Dreaming of a raven is not good news. It can forebode illness, misfortune, or even death.o see a bird's nest in your dream signifies comfort, safety, and protection. The dream may also symbolize new opportunities. To see an owl in a dream is symbolic of wisdom and virtue. To dream of a parakeet means that an idea lacks originality and energy and may fail.