Answer
(1) Voltage-gated
(2) Mechanically-gated
(3) Ligand-gated
Work Step by Step
(1) Voltage-gated: In this form of gating, the channel opens or closes in response to a change in the electrical charge applied to the cell membrane. In excitable cells like neurons and muscle cells, voltage-gated ion channels are frequently present.
(2) A specific substance, such as a neurotransmitter, must attach to a receptor on the channel protein in order for this form of gating to occur. By altering the channel's geometry as a result of this binding, ions can now pass through.
(3) A physical force or deformation of the cell membrane is used in mechanically-gated gating to open or close the channel. In cells such as touch receptors and hair cells in the inner ear, which react to physical stimuli like touch or pressure, mechanically-gated channels are present.
