| 释义 |
DictionarySeehyperpolarizehyperpolarization
hyperpolarization [hi″per-po″ler-ĭz-a´shun] any increase in the amount of electrical charge separated by the cell membrane and hence in the strength of the potential" >membrane potential. In cardiology this is the process by which an electrical fiber, at the end of phase 3 repolarization, becomes more negative than usual.hy·per·po·lar·i·za·tion (hī'pĕr-pō'lăr-i-zā'shŭn), An increase in polarization of membranes of nerves or muscle cells; the reverse change from that associated with excitatory action.hy·per·po·lar·i·za·tion (hī'pĕr-pō'lăr-ī-zā'shŭn) An increase in polarization of membranes of nerves or muscle cells, which makes the cell less sensitive to any stimulus; the reverse change from that associated with excitatory action. hyperpolarizationA change in the value of the resting membrane potential towards a more negative value. The inside of the cell becomes more negative than the outside. Hyperpolarization is inhibitory because the membrane potential moves away from the neuron's threshold at which an action potential could occur. Example: the retinal photoreceptor potentials when stimulated by light. See depolarization; receptor potential; resting membrane potential; synapse.hy·per·po·lar·i·za·tion (hī'pĕr-pō'lăr-ī-zā'shŭn) Increased polarization of membranes of nerves or muscle cells. |