Which of the following ion channels are always sensitive to small changes in electric charge? stress-activated channels ligand-gated channels with extracellular ligands voltage-gated channels ligand-gated channels with intracellular ligands all of the above
Which of the following ion channels are always sensitive to small changes in electric charge?
- stress-activated channels
- ligand-gated channels with extracellular ligands
- voltage-gated channels
- ligand-gated channels with intracellular ligands
- all of the above
Transport through the cell membrane is important for cells to supply nutrients, ions, and other essential substances. Different types of channels and pumps help in this process. They are voltage-gated channels, ligand-gated channels, stress-activated channels.
Membrane proteins that span the entire cell membrane alone can serve as a membrane channel. A membrane channel aids in the transfer of substances from one side of the cell membrane which is selectively permeable to the other side of the membrane. Such integral proteins are known as transmembrane proteins.
Some channel proteins always allow passage of solutes continually and are called as leak channels, while some other channels pass materials under different conditions and are called as gated channels. Such stimuli include the binding of a ligand (chemical messenger), the difference in electrical potential, and physical (stretch and pressure) stress on a cell.
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