10.5E: The Action Potential and Propagation
The action potential has three main stages: depolarization, repolarization, and hyperpolarization. Depolarization is caused when positively charged sodium ions rush into a neuron with the opening of voltage-gated sodium channels.
Action potential: Definition, Steps, Phases - Kenhub
2023年11月3日 · An action potential is caused by either threshold or suprathreshold stimuli upon a neuron. It consists of three phases: depolarization, overshoot, and repolarization. An action potential propagates along the cell membrane of an axon until it reaches the terminal button.
12.5 The Action Potential – Anatomy & Physiology
The action potential must propagate from the trigger zone toward the axon terminals. Propagation, as described above, applies to unmyelinated axons. When myelination is present, the action potential propagates differently, and is optimized for the speed of signal conduction.
12.4 The Action Potential - Anatomy and Physiology 2e - OpenStax
Propagation of the Action Potential. The action potential is initiated at the beginning of the axon, at what is called the initial segment. There is a high density of voltage-gated Na + channels so that rapid depolarization can take place here.
Action potential - Wikipedia
In neurons, action potentials play a central role in cell–cell communication by providing for—or with regard to saltatory conduction, assisting—the propagation of signals along the neuron's axon toward synaptic boutons situated at the ends of an axon; these signals can then connect with other neurons at synapses, or to motor cells or glands.
Action Potential Propagation – Physiology
Explain the propagation of an action potential down an axon and describe how the refractory period contributes to this. The propagating action potential depolarizes the axon in front of it, bring it to threshold so it too can generate an action potential.
Action Potential - The Definitive Guide - Biology Dictionary
2020年6月9日 · In peripheral neurons, action potential propagation occurs at the nodes of Ranvier between individual Schwann cells. Schwann cells cover the axon of the neuron in myelin, a form of insulation that stops voltage-dependent sodium channels from letting sodium ions in.
16.5: The Action Potential - Biology LibreTexts
2022年7月30日 · Propagation of the Action Potential. The action potential is initiated at the beginning of the axon, at what is called the initial segment. There is a high density of voltage-gated Na + channels so that rapid depolarization can take place here.
The Action Potential - TeachMePhysiology
2023年9月23日 · Propagation of Action Potentials. Action potentials are propagated along the axons of neurones via local currents. Local currents induce depolarisation of the adjacent axonal membrane. Where this reaches a threshold, further action potentials are generated.
Ch. 3: Propagation of Action Potentials | McGovern Medical School
2020年10月5日 · Propagation of action potentials in myelinated fibers is illustrated in Figure 3.4. Start with an action potential at a node on the left. In the absence of myelin, the action potential would propagate actively through the simple mechanisms discussed above.