from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The semipermeable membrane that encloses the cytoplasm of a cell. Also called cytomembrane, plasmalemma, plasma membrane.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The semipermeable membrane that surrounds the cytoplasm of a cell.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a thin membrane (a double layer of lipids) enclosing the cytoplasm of a cell; proteins in the membrane control passage of ions (like sodium or potassium or calcium) in and out of the cell
Sorry, no etymologies found.
That requires depolarization of the cell membrane and the restoring of the ionic concentrations of potassium and sodium in less than a thousandth of a second.
Puncture a cell membrane with an ultra-sharp needle and then withdraw the needle.
In the biosystem of an axon, the influx of bulky sodium ions through gated channels that pierce the cell membrane must propagate the signal.
The signaling nerve’s neurotransmitters, upon binding to a muscle fiber, stimulate calcium ion channels in the muscle cell membrane to open.