The action potential is a wave of electricity that travels down the axon of neuron from the cell body to the axon terminals.
An all-or-none electrical event (neural impulse) in an axon or muscle fibre in which the polarity of the membrane potential is rapidly reversed and re-established. Action potentials begin at one end of the axon of a neurone and move along the axon to the other end. action potential. the nerve impulse, the sign of activity and the basis of activity in individual neurons in the nervous system. The measure of the activity of an individual nerve cell is indicated by the frequency of its discharge. 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. Several 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. Please try again later. An action potential (or nerve impulse) is a transient alteration of the transmembrane voltage (or membrane potential) across an excitable membrane in an excitable cell (such as a neuron or myocyte) generated by the activity of voltage-gated ion channels embedded in the membrane.  Action potential. Definition. noun. A short-term change in the electrical potential on the surface of a cell (e.g. a nerve cell or muscle cell) in response to stimulation, and then leads to the transmission of an electrical impulse (nerve impulse) that travels across the cell membrane. The action potential allows nerve cells to transmit a signal over a distance. An action potential is described as all-or-none, since they either occur fully or they do not occur at all. The course of the action potential can be divided into five phases: 1  rising phase. 2  peak phase. 3  falling phase. • a wave of electricity that travels down the axon of neuron • from the cell body to the axon terminals This wave of electricity is actually a brief change in the resting membrane potential of the neuron • from -70mv to +35mv Then the membrane returns to its resting potential of -70mv. • Briefly opening more membrane gates for Na+ and then for K+ • Thus making the neuron cell membrane o More permeable first to Na+ o Then to K+ • This causes a change in the numbers of plus charges inside and outside the cell membrane o Changing the cell membrane potential. An action potential works by. • Briefly opening more membrane gates for Na+ and then for K+ • Thus making the neuron cell membrane o More permeable first to Na+ o Then to K+ • This causes a change in the numbers of plus charges inside and outside the cell membrane o Changing the cell membrane potential. On an electrocardiogram, action potential is seen as the cardiac cycle of a single cell, produced by a rapid sequence of changes at the cell membrane, and consists of phase 0 to phase 4, with phases 0 to 3 representing electrical systole and phase 4 representing electrical diastole. action potential. the nerve impulse, the sign of activity and the basis of activity in individual neurons in the nervous system. The measure of the activity of an individual nerve cell is indicated by the frequency of its discharge. The action potential is. • a wave of electricity that travels down the axon of neuron • from the cell body to the axon terminals This wave of electricity is actually a brief change in the resting membrane potential of the neuron • from -70mv to +35mv Then the membrane returns to its resting potential of -70mv.   . • Briefly opening more membrane gates for Na+ and then for K+ • Thus making the neuron cell membrane o More permeable first to Na+ o Then to K+ • This causes a change in the numbers of plus charges inside and outside the cell membrane o Changing the cell membrane potential. The principal ions involved in an action potential are sodium and potassium cations; sodium ions enter the cell, and potassium ions leave, restoring equilibrium. Relatively few ions need to cross the membrane for the membrane voltage to change drastically. Several 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. In neurons, they play a central role in cell-to-cell communication. In other types of cells, their main function is to activate intracellular processes. In muscle cells, for example, an action potential is the first step in the chain of events leading to contraction. Several 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.
http://medical-dictionary.thefreedictionary.com/action+potential https://en.wikipedia.org/wiki/Action_potential http://www.youtube.com/watch?v=U0NpTdge3aw http://www.biology-online.org/dictionary/Action_potential https://quizlet.com/7466484/ap-action-potential-flash-cards/ https://quizlet.com/7466484/ap-action-potential-flash-cards/ http://medical-dictionary.thefreedictionary.com/action+potential https://quizlet.com/7466484/ap-action-potential-flash-cards/ https://en.wikipedia.org/wiki/Action_potential https://en.wikipedia.org/wiki/Action_potential
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