Sound waves enter your ear canal, and the ear drum starts to vibrate. This tremble causes tiny bones to move, "knocking" on the membrane window. Cochela has a ton of little hairs inside it, and once you activate it with the membrane window, those hairs change the vibrations to an electrical signal. That signal moves to your brain, and your brain tells you that you hear a sound.
The best statement that best describes the effect nicotine has on the nervous system is it acts as a stimulant and a sedative. The correct answer is C.
