Which of the following best describes the difference between chemically gated and voltage-gated ion channels? 

• A. Chemically gated channels open in response to changes in membrane potential, while voltage-gated channels open when specific chemicals bind to them.
• B. Chemically gated channels respond to physical distortion of the membrane, while voltage-gated channels open or close in response to changes in membrane potential.
• C. Chemically gated channels open or close when they bind specific chemicals, while voltage-gated channels open or close in response to changes in membrane potential.
• D. Chemically gated channels are abundant in sensory receptors, while voltage-gated channels are characteristic of excitable cell membranes.

Answer: (C)