Unformatted text preview: Active transporters use ATP or a similar energy source to transport ions, often against a concentration gradient. Ion channels do not require ATP. 8. What are characteristics of passive current flow across cell membranes? Can be b idirectional, travels near the speed of light, decays rapidly 9-10. When a membrane potential becomes more negative than the resting potential, it is called a ___________________. When a membrane potential becomes more positive than the resting potential, it is called a __________________. Hyperpolarization, depolarization º¿º Briefly define one of the following: refractory period, nodes of Ranvier, or Nernst equation? TWO sentences MAX!...
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- Spring '10
- Physiology, Bio 365R Vertebrate, nerve cell. action