How Do Neurons Become Excited?

How Do Neurons Become Excited?
Neurons become excited in response to a stimulus. Sensory neurons
are sensitive to specific stimuli in their surrounding environment. For
example, sensory neurons found in human skin are sensitive to touch,
pain, and change in temperature outside of the body. Meanwhile, sensory
neurons located inside the body are sensitive to pain and changes in tem-
perature inside the body. Sensory receptors in the ears, eyes, nose, and
mouth register sound, light, smell, and taste, respectively. Once these
neurons are excited by a stimulus, the excitability or impulse moves along
that neuron toward the brain, where it is interpreted. Our brain initiates
impulses as well. Some of these impulses travel throughout the brain for
thinking processes and memory recall. Or these impulses may travel away
from the brain toward destinations outside the central nervous system
such as skeletal muscle, the heart, and other organs.