Definitions

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

Etymologies

Sorry, no etymologies found.

Examples

  • 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.

    THE HIDDEN FACE OF GOD

  • Puncture a cell membrane with an ultra-sharp needle and then withdraw the needle.

    THE HIDDEN FACE OF GOD

  • 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 HIDDEN FACE OF GOD

  • The signaling nerve’s neurotransmitters, upon binding to a muscle fiber, stimulate calcium ion channels in the muscle cell membrane to open.

    THE HIDDEN FACE OF GOD

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