Voltage-gated channels are proteins in the cell membrane which open when stimulated by a voltage (an electrical signal). The voltage causes the channel to open, thereby allowing the entry or exit of whatever substance the channel relates to.
An example of this the the voltage-gated sodium channels on neurons. When an action potential (a voltage), passes over the cell, it open these channels and allows sodium to enter the cell.
Voltage gated ion channels open and close in response to changes in the membrane potential of the cell. When the membrane potential reaches a certain point, the protein structure of the channel well shift, allowing the passage of specific ions through it. For example, there is an voltage gated ion channel that allows the passage of potassium ions out of the cell when the cell becomes too depolarized.
See also computer chips and semiconductor materials.
Channel Protein.
Carrier Proteins and Channel ProteinsReceptor ProteinsGlycoproteinsSource: Currently doing AS-Level Biology.
It is a selectively permeable membrane that allows certain substances in and out, but keeps harmful substances from entering the cell. It could be compared to the security guard at the door of an airport that makes sure that nobody dangerous gets in or out.
The ear drum. the medical term is the tympanic membrane
the cell membrane. It is a protein mosaic this is hydrophobic on both sides and hydrophllic in the center.
Protein channels help move particles across the cell membrane
Channel proteins, a type of transport proteins to the cells, move molecules from outside of the membrane to the inside
The nuclear PORE membrane
a chemically gated channel
Channel proteins.
turtles
osmosis
transportation
proteins
Mechanically-gated
channel proteins
A protein that forms an ion channel through a membrane is most likely to be a transmembrane protein.