NSCI 1051 Study Guide - Ion Channel, Electric Current, Tetraodontidae
11 Mar 2014
School
Department
Course
Professor
Document Summary
The inside of the membrane going from negative to positive. Action potential skipping from node to node down a myelinated axon. Nerve impulse, rapid reversal of the inside of the membrane becoming positively charged. Protein molecules with pores that allow ions of specified size and charge to pass through. Opening and closing of channel is a probabilistic process. The probability of opening or closing is due to: A protein that transports ions across a membrane at the expense of metabolic energy. A property of ion channels that are selectively permeable to some ions and not to others. The temperature-dependent movement of molecules from regions of high concentration to low concentration, resulting in a more even distribution. The rate of movement of electrical charge (amp) The force exerted on an electrically charged particle. Gap junction: cannot be opened again by depolarization, blocked by toxins (puffer fish), or disorders. Controls how much sodium and potassium crosses the cellular membrane.
