1.2.3: Nervous System

cell

tissue

organ

system

Receptors in the ears send a nerve impulse that travels to the spinal cord.

A nerve impulse passes through the spinal cord to the brain.

The brain processes the signal as sound and interprets the signal that you recognize as your name.

The brain sends a message to the muscles to turn toward the source of the sound.

The spinal cord passes the nerve impulse to the muscles of the body, which cause the body to move.