Final answer:
Gated channels in cell membranes are controlled by stimuli like chemical or electrical signals, temperature, or mechanical force, and are vital for cell function in transmitting electrical impulses and causing muscle contractions.
Step-by-step explanation:
Gated channels are passages across cell membranes that are controlled by various stimuli. These stimuli may include chemical or electrical signals, temperature, or mechanical force. For instance, in nerve cells, the sodium gated channels open in response to a chemical signal, allowing sodium ions to flow in and facilitate electrical transmission along the neuron's membrane.
In the case of mechanically gated channels, physical distortions such as pressure or touch can trigger the opening of the channels, as seen in sensory cells associated with touch. Temperature changes can also open thermally gated channels, which are important in sensation.
Overall, gated channels are crucial for the function of cells, especially in tissues such as nervous or muscular systems where they play a key role in transmitting electrical impulses or causing muscle contractions.